diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38de66eac..ab39df551 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -360,6 +360,8 @@
   * Added support for **multiple atlas textures at `SkeletonGraphic`**. You can enable this feature by enabling the parameter `Multiple CanvasRenders` in the `Advanced` section of the `SkeletonGraphic` Inspector. This automatically creates the required number of child `CanvasRenderer` GameObjects for each required draw call (submesh).
   * Added support for **Render Separator Slots** at `SkeletonGraphic`. Render separation can be enabled directly in the `Advanced` section of the `SkeletonGraphic` Inspector, it does not require any additional components (like `SkeletonRenderSeparator` or `SkeletonPartsRenderer` for `SkeletonRenderer` components). When enabled, additional separator GameObjects will be created automatically for each separation part, and `CanvasRenderer` GameObjects re-parented to them accordingly. The separator GameObjects can be moved around and re-parented in the hierarchy according to your requirements to achieve the desired draw order within your `Canvas`. A usage example can be found in the updated `Spine Examples/Other Examples/SkeletonRenderSeparator` scene.
   * Added `SkeletonGraphicCustomMaterials` component, providing functionality to override materials and textures of a `SkeletonGraphic`, similar to `SkeletonRendererCustomMaterials`. Note: overriding materials or textures per slot is not provided due to structural limitations.
+  * Added **Root Motion support** for `SkeletonAnimation`, `SkeletonMecanim` and `SkeletonGraphic` via new components `SkeletonRootMotion` and `SkeletonMecanimRootMotion`. The `SkeletonAnimation` and `SkeletonGraphic` component Inspector now provides a line `Root Motion` with `Add Component` and `Remove Component` buttons to add/remove the new `SkeletonRootMotion` component to your GameObject. The `SkeletonMecanim` Inspector detects whether root motion is enabled at the `Animator` component and adds a `SkeletonMecanimRootMotion` component automatically.
+  * `SkeletonMecanim` now provides an additional `Custom MixMode` parameter under `Mecanim Translator`. It is enabled by default in version 3.8 to maintain current behaviour, using the set `Mix Mode` for each Mecanim layer. When disabled, `SkeletonMecanim` will use the recommended `MixMode` according to the layer blend mode. Additional information can be found in the [Mecanim Translator section](http://esotericsoftware.com/spine-unity#Parameters-for-animation-blending-control) on the spine-unity documentation pages.
 
 * **Changes of default values**
   * `SkeletonMecanim`'s `Layer Mix Mode` now defaults to `MixMode.MixNext` instead of `MixMode.MixAlways`.
diff --git a/spine-cocos2dx/src/spine/SkeletonRenderer.cpp b/spine-cocos2dx/src/spine/SkeletonRenderer.cpp
index 569c69d1a..d7331158f 100644
--- a/spine-cocos2dx/src/spine/SkeletonRenderer.cpp
+++ b/spine-cocos2dx/src/spine/SkeletonRenderer.cpp
@@ -48,6 +48,7 @@ namespace spine {
 		bool cullRectangle(Renderer* renderer, const Mat4& transform, const cocos2d::Rect& rect);
 			Color4B ColorToColor4B(const Color& color);
 		bool slotIsOutRange(Slot& slot, int startSlotIndex, int endSlotIndex);
+		bool nothingToDraw(Slot& slot, int startSlotIndex, int endSlotIndex);
 	}
 
 // C Variable length array
@@ -301,18 +302,7 @@ namespace spine {
 		for (int i = 0, n = _skeleton->getSlots().size(); i < n; ++i) {
 			Slot* slot = _skeleton->getDrawOrder()[i];;
 
-			if (slotIsOutRange(*slot, _startSlotIndex, _endSlotIndex)) {
-				_clipper->clipEnd(*slot);
-				continue;
-			}
-
-			if (!slot->getAttachment()) {
-				_clipper->clipEnd(*slot);
-				continue;
-			}
-
-			// Early exit if slot is invisible
-			if (slot->getColor().a == 0 || !slot->getBone().isActive()) {
+			if (nothingToDraw(*slot, _startSlotIndex, _endSlotIndex)) {
 				_clipper->clipEnd(*slot);
 				continue;
 			}
@@ -324,12 +314,6 @@ namespace spine {
 				RegionAttachment* attachment = static_cast<RegionAttachment*>(slot->getAttachment());
 				attachmentVertices = static_cast<AttachmentVertices*>(attachment->getRendererObject());
 
-				// Early exit if attachment is invisible
-				if (attachment->getColor().a == 0) {
-					_clipper->clipEnd(*slot);
-					continue;
-				}
-
 				float* dstTriangleVertices = nullptr;
 				int dstStride = 0; // in floats
 				if (hasSingleTint) {
@@ -556,7 +540,7 @@ namespace spine {
 						}
 					}
 				} else {
-					
+
 #if COCOS2D_VERSION < 0x00040000
 					TwoColorTrianglesCommand* batchedTriangles = lastTwoColorTrianglesCommand = twoColorBatch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture->getName(), _glProgramState, blendFunc, trianglesTwoColor, transform, transformFlags);
 #else
@@ -641,7 +625,7 @@ namespace spine {
 #endif
 
 		DrawNode* drawNode = DrawNode::create();
-        drawNode->setGlobalZOrder(getGlobalZOrder()); 
+        drawNode->setGlobalZOrder(getGlobalZOrder());
 
 		// Draw bounding rectangle
 		if (_debugBoundingRect) {
@@ -935,21 +919,32 @@ namespace spine {
 			return startSlotIndex > index || endSlotIndex < index;
 		}
 
+		bool nothingToDraw(Slot& slot, int startSlotIndex, int endSlotIndex) {
+			Attachment *attachment = slot.getAttachment();
+			if (!attachment ||
+				slotIsOutRange(slot, startSlotIndex, endSlotIndex) ||
+				!slot.getBone().isActive() ||
+				slot.getColor().a == 0)
+				return true;
+			if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
+				if (static_cast<RegionAttachment*>(attachment)->getColor().a == 0)
+					return true;
+			}
+			else if (attachment->getRTTI().isExactly(MeshAttachment::rtti)) {
+				if (static_cast<MeshAttachment*>(attachment)->getColor().a == 0)
+					return true;
+			}
+			return false;
+		}
+
 		int computeTotalCoordCount(Skeleton& skeleton, int startSlotIndex, int endSlotIndex) {
 			int coordCount = 0;
 			for (size_t i = 0; i < skeleton.getSlots().size(); ++i) {
 				Slot& slot = *skeleton.getSlots()[i];
+				if (nothingToDraw(slot, startSlotIndex, endSlotIndex)) {
+					continue;
+				}
 				Attachment* const attachment = slot.getAttachment();
-				if (!attachment) {
-					continue;
-				}
-				if (slotIsOutRange(slot, startSlotIndex, endSlotIndex)) {
-					continue;
-				}
-					// Early exit if slot is invisible
-				if (slot.getColor().a == 0) {
-					continue;
-				}
 				if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
 					coordCount += 8;
 				}
@@ -969,16 +964,10 @@ namespace spine {
 #endif
 			for (size_t i = 0; i < skeleton.getSlots().size(); ++i) {
 				/*const*/ Slot& slot = *skeleton.getDrawOrder()[i]; // match the draw order of SkeletonRenderer::Draw
+				if (nothingToDraw(slot, startSlotIndex, endSlotIndex)) {
+					continue;
+				}
 				Attachment* const attachment = slot.getAttachment();
-				if (!attachment) {
-					continue;
-				}
-				if (slotIsOutRange(slot, startSlotIndex, endSlotIndex)) {
-					continue;
-				}
-				if (slot.getColor().a == 0) {
-					continue;
-				}
 				if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
 					RegionAttachment* const regionAttachment = static_cast<RegionAttachment*>(attachment);
 					assert(dstPtr + 8 <= dstEnd);
@@ -1010,7 +999,7 @@ namespace spine {
 
 		BlendFunc makeBlendFunc(BlendMode blendMode, bool premultipliedAlpha) {
 			BlendFunc blendFunc;
-			
+
 #if COCOS2D_VERSION < 0x00040000
 			switch (blendMode) {
 			case BlendMode_Additive:
@@ -1056,15 +1045,15 @@ namespace spine {
 		bool cullRectangle(Renderer* renderer, const Mat4& transform, const cocos2d::Rect& rect) {
 			if (Camera::getVisitingCamera() == nullptr)
 				return false;
-			
+
 			auto director = Director::getInstance();
 			auto scene = director->getRunningScene();
-						
+
 			if (!scene || (scene && Camera::getDefaultCamera() != Camera::getVisitingCamera()))
 				return false;
 
 			Rect visibleRect(director->getVisibleOrigin(), director->getVisibleSize());
-			
+
 			// transform center point to screen space
 			float hSizeX = rect.size.width/2;
 			float hSizeY = rect.size.height/2;
@@ -1075,7 +1064,7 @@ namespace spine {
 			// convert content size to world coordinates
 			float wshw = std::max(fabsf(hSizeX * transform.m[0] + hSizeY * transform.m[4]), fabsf(hSizeX * transform.m[0] - hSizeY * transform.m[4]));
 			float wshh = std::max(fabsf(hSizeX * transform.m[1] + hSizeY * transform.m[5]), fabsf(hSizeX * transform.m[1] - hSizeY * transform.m[5]));
-			
+
 			// enlarge visible rect half size in screen coord
 			visibleRect.origin.x -= wshw;
 			visibleRect.origin.y -= wshh;
diff --git a/spine-cpp/spine-cpp/src/spine/AnimationState.cpp b/spine-cpp/spine-cpp/src/spine/AnimationState.cpp
index 657770396..845c5e206 100644
--- a/spine-cpp/spine-cpp/src/spine/AnimationState.cpp
+++ b/spine-cpp/spine-cpp/src/spine/AnimationState.cpp
@@ -1031,9 +1031,9 @@ void AnimationState::computeHold(TrackEntry *entry) {
 			} else {
 				for (TrackEntry *next = to->_mixingTo; next != NULL; next = next->_mixingTo) {
 					if (next->_animation->hasTimeline(id)) continue;
-					if (entry->_mixDuration > 0) {
+					if (next->_mixDuration > 0) {
 						timelineMode[i] = HoldMix;
-						timelineHoldMix[i] = entry;
+						timelineHoldMix[i] = next;
 						i++;
 						goto continue_outer; // continue outer;
 					}
diff --git a/spine-csharp/src/Animation.cs b/spine-csharp/src/Animation.cs
index e0107fb84..70c1b33ee 100644
--- a/spine-csharp/src/Animation.cs
+++ b/spine-csharp/src/Animation.cs
@@ -43,9 +43,13 @@ namespace Spine {
 		public Animation (string name, ExposedList<Timeline> timelines, float duration) {
 			if (name == null) throw new ArgumentNullException("name", "name cannot be null.");
 			if (timelines == null) throw new ArgumentNullException("timelines", "timelines cannot be null.");
-			this.timelineIds = new HashSet<int>();
-			foreach (Timeline timeline in timelines)
-				timelineIds.Add(timeline.PropertyId);
+			// Note: avoiding reallocations by adding all hash set entries at
+			// once (EnsureCapacity() is only available in newer .Net versions).
+			int[] propertyIDs = new int[timelines.Count];
+			for (int i = 0; i < timelines.Count; ++i) {
+				propertyIDs[i] = timelines.Items[i].PropertyId;
+			}
+			this.timelineIds = new HashSet<int>(propertyIDs);
 			this.name = name;
 			this.timelines = timelines;
 			this.duration = duration;
diff --git a/spine-csharp/src/AnimationState.cs b/spine-csharp/src/AnimationState.cs
index 67c66a8d1..808373047 100644
--- a/spine-csharp/src/AnimationState.cs
+++ b/spine-csharp/src/AnimationState.cs
@@ -85,6 +85,25 @@ namespace Spine {
 
 		public delegate void TrackEntryEventDelegate (TrackEntry trackEntry, Event e);
 		public event TrackEntryEventDelegate Event;
+
+		public void AssignEventSubscribersFrom (AnimationState src) {
+			Event = src.Event;
+			Start = src.Start;
+			Interrupt = src.Interrupt;
+			End = src.End;
+			Dispose = src.Dispose;
+			Complete = src.Complete;
+		}
+
+		public void AddEventSubscribersFrom (AnimationState src) {
+			Event += src.Event;
+			Start += src.Start;
+			Interrupt += src.Interrupt;
+			End += src.End;
+			Dispose += src.Dispose;
+			Complete += src.Complete;
+		}
+
 		// end of difference
 		private readonly EventQueue queue; // Initialized by constructor.
 		private readonly HashSet<int> propertyIDs = new HashSet<int>();
diff --git a/spine-csharp/src/SkeletonBinary.cs b/spine-csharp/src/SkeletonBinary.cs
index e4ce5538c..810c22b72 100644
--- a/spine-csharp/src/SkeletonBinary.cs
+++ b/spine-csharp/src/SkeletonBinary.cs
@@ -883,6 +883,7 @@ namespace Spine {
 
 		internal class SkeletonInput {
 			private byte[] chars = new byte[32];
+			private byte[] bytesBigEndian = new byte[4];
 			internal ExposedList<String> strings;
 			Stream input;
 
@@ -905,15 +906,20 @@ namespace Spine {
 			}
 
 			public float ReadFloat () {
-				chars[3] = (byte)input.ReadByte();
-				chars[2] = (byte)input.ReadByte();
-				chars[1] = (byte)input.ReadByte();
-				chars[0] = (byte)input.ReadByte();
+				input.Read(bytesBigEndian, 0, 4);
+				chars[3] = bytesBigEndian[0];
+				chars[2] = bytesBigEndian[1];
+				chars[1] = bytesBigEndian[2];
+				chars[0] = bytesBigEndian[3];
 				return BitConverter.ToSingle(chars, 0);
 			}
 
 			public int ReadInt () {
-				return (input.ReadByte() << 24) + (input.ReadByte() << 16) + (input.ReadByte() << 8) + input.ReadByte();
+				input.Read(bytesBigEndian, 0, 4);
+				return (bytesBigEndian[0] << 24)
+					+ (bytesBigEndian[1] << 16)
+					+ (bytesBigEndian[2] << 8)
+					+ bytesBigEndian[3];
 			}
 
 			public int ReadInt (bool optimizePositive) {
diff --git a/spine-ts/webgl/demos/demos.js b/spine-ts/webgl/demos/demos.js
index 4b654aa84..e121f2fe3 100644
--- a/spine-ts/webgl/demos/demos.js
+++ b/spine-ts/webgl/demos/demos.js
@@ -4,7 +4,6 @@ $(function () {
 		alert("Error: " + message + "\n" + "URL:" + url + "\nLine: " + lineNo);
 	}
 
-
 	spineDemos.init();
 	spineDemos.assetManager = new spine.SharedAssetManager("assets/");
 
diff --git a/spine-ts/webgl/example/barebones.html b/spine-ts/webgl/example/barebones.html
new file mode 100644
index 000000000..47a450156
--- /dev/null
+++ b/spine-ts/webgl/example/barebones.html
@@ -0,0 +1,157 @@
+<html>
+<script src="../../build/spine-webgl.js"></script>
+<style>
+* { margin: 0; padding: 0; }
+body, html { height: 100% }
+canvas { position: absolute; width: 100% ;height: 100%; }
+</style>
+<body>
+<canvas id="canvas"></canvas>
+<script>
+
+var canvas;
+var gl;
+var shader;
+var batcher;
+var mvp = new spine.webgl.Matrix4();
+var assetManager;
+var skeletonRenderer;
+
+var lastFrameTime;
+var spineboy;
+
+function init () {
+	// Setup canvas and WebGL context. We pass alpha: false to canvas.getContext() so we don't use premultiplied alpha when
+	// loading textures. That is handled separately by PolygonBatcher.
+	canvas = document.getElementById("canvas");
+	canvas.width = window.innerWidth;
+	canvas.height = window.innerHeight;
+	var config = { alpha: false };
+	gl = canvas.getContext("webgl", config) || canvas.getContext("experimental-webgl", config);
+	if (!gl) {
+		alert('WebGL is unavailable.');
+		return;
+	}
+
+	// Create a simple shader, mesh, model-view-projection matrix, SkeletonRenderer, and AssetManager.
+	shader = spine.webgl.Shader.newTwoColoredTextured(gl);
+	batcher = new spine.webgl.PolygonBatcher(gl);
+	mvp.ortho2d(0, 0, canvas.width - 1, canvas.height - 1);
+	skeletonRenderer = new spine.webgl.SkeletonRenderer(gl);
+	assetManager = new spine.webgl.AssetManager(gl);
+
+	// Tell AssetManager to load the resources for each skeleton, including the exported .skel file, the .atlas file and the .png
+	// file for the atlas. We then wait until all resources are loaded in the load() method.
+	assetManager.loadBinary("assets/spineboy-pro.skel");
+	assetManager.loadTextureAtlas("assets/spineboy-pma.atlas");
+	requestAnimationFrame(load);
+}
+
+function load () {
+	// Wait until the AssetManager has loaded all resources, then load the skeletons.
+	if (assetManager.isLoadingComplete()) {
+		spineboy = loadSpineboy("run", true);
+		lastFrameTime = Date.now() / 1000;
+		requestAnimationFrame(render); // Loading is done, call render every frame.
+	} else {
+		requestAnimationFrame(load);
+	}
+}
+
+function loadSpineboy (initialAnimation, premultipliedAlpha) {
+	// Load the texture atlas from the AssetManager.
+	var atlas = assetManager.get("assets/spineboy-pma.atlas");
+
+	// Create a AtlasAttachmentLoader that resolves region, mesh, boundingbox and path attachments
+	var atlasLoader = new spine.AtlasAttachmentLoader(atlas);
+
+	// Create a SkeletonBinary instance for parsing the .skel file.
+	var skeletonBinary = new spine.SkeletonBinary(atlasLoader);
+
+	// Set the scale to apply during parsing, parse the file, and create a new skeleton.
+	skeletonBinary.scale = 1;
+	var skeletonData = skeletonBinary.readSkeletonData(assetManager.get("assets/spineboy-pro.skel"));
+	var skeleton = new spine.Skeleton(skeletonData);
+	var bounds = calculateSetupPoseBounds(skeleton);
+
+	// Create an AnimationState, and set the initial animation in looping mode.
+	var animationStateData = new spine.AnimationStateData(skeleton.data);
+	var animationState = new spine.AnimationState(animationStateData);
+	animationState.setAnimation(0, initialAnimation, true);
+
+	// Pack everything up and return to caller.
+	return { skeleton: skeleton, state: animationState, bounds: bounds, premultipliedAlpha: premultipliedAlpha };
+}
+
+function calculateSetupPoseBounds (skeleton) {
+	skeleton.setToSetupPose();
+	skeleton.updateWorldTransform();
+	var offset = new spine.Vector2();
+	var size = new spine.Vector2();
+	skeleton.getBounds(offset, size, []);
+	return { offset: offset, size: size };
+}
+
+function render () {
+	var now = Date.now() / 1000;
+	var delta = now - lastFrameTime;
+	lastFrameTime = now;
+
+	// Update the MVP matrix to adjust for canvas size changes
+	resize();
+
+	gl.clearColor(0.3, 0.3, 0.3, 1);
+	gl.clear(gl.COLOR_BUFFER_BIT);
+
+	// Apply the animation state based on the delta time.
+	var skeleton = spineboy.skeleton;
+	var state = spineboy.state;
+	var premultipliedAlpha = spineboy.premultipliedAlpha;
+	state.update(delta);
+	state.apply(skeleton);
+	skeleton.updateWorldTransform();
+
+	// Bind the shader and set the texture and model-view-projection matrix.
+	shader.bind();
+	shader.setUniformi(spine.webgl.Shader.SAMPLER, 0);
+	shader.setUniform4x4f(spine.webgl.Shader.MVP_MATRIX, mvp.values);
+
+	// Start the batch and tell the SkeletonRenderer to render the active skeleton.
+	batcher.begin(shader);
+	skeletonRenderer.premultipliedAlpha = premultipliedAlpha;
+	skeletonRenderer.draw(batcher, skeleton);
+	batcher.end();
+
+	shader.unbind();
+
+	requestAnimationFrame(render);
+}
+
+function resize () {
+	var w = canvas.clientWidth;
+	var h = canvas.clientHeight;
+	if (canvas.width != w || canvas.height != h) {
+		canvas.width = w;
+		canvas.height = h;
+	}
+
+	// Calculations to center the skeleton in the canvas.
+	var bounds = spineboy.bounds;
+	var centerX = bounds.offset.x + bounds.size.x / 2;
+	var centerY = bounds.offset.y + bounds.size.y / 2;
+	var scaleX = bounds.size.x / canvas.width;
+	var scaleY = bounds.size.y / canvas.height;
+	var scale = Math.max(scaleX, scaleY) * 1.2;
+	if (scale < 1) scale = 1;
+	var width = canvas.width * scale;
+	var height = canvas.height * scale;
+
+	mvp.ortho2d(centerX - width / 2, centerY - height / 2, width, height);
+	gl.viewport(0, 0, canvas.width, canvas.height);
+}
+
+init();
+
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/spine-ts/webgl/example/index.html b/spine-ts/webgl/example/index.html
index ab69a6e91..a6d1abd33 100644
--- a/spine-ts/webgl/example/index.html
+++ b/spine-ts/webgl/example/index.html
@@ -2,9 +2,9 @@
 <script src="../../build/spine-webgl.js"></script>
 <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
 <style>
-	* { margin: 0; padding: 0; }
-	body, html { height: 100% }
-	canvas { position: absolute; width: 100% ;height: 100%; }
+* { margin: 0; padding: 0; }
+body, html { height: 100% }
+canvas { position: absolute; width: 100% ;height: 100%; }
 </style>
 <body>
 <canvas id="canvas"></canvas>
@@ -15,21 +15,22 @@
 <span>Skin:</span><select id="skinList"></select>
 <span>Vertex Effect:</span><select id="effectList"></select>
 <span>Debug:</span><input type="checkbox" id="debug">
-<div>
+</div>
 </center>
-</body>
 <script>
 
-var lastFrameTime = Date.now() / 1000;
 var canvas;
+var gl;
 var shader;
 var batcher;
-var gl;
 var mvp = new spine.webgl.Matrix4();
-var assetManager;
 var skeletonRenderer;
+var assetManager;
+
 var debugRenderer;
 var shapes;
+
+var lastFrameTime;
 var skeletons = {};
 var activeSkeleton = "spineboy";
 var swirlEffect = new spine.SwirlEffect(0);
@@ -49,11 +50,14 @@ function init () {
 		return;
 	}
 
-	// Create a simple shader, mesh, model-view-projection matrix and SkeletonRenderer.
+	// Create a simple shader, mesh, model-view-projection matrix, SkeletonRenderer, and AssetManager.
 	shader = spine.webgl.Shader.newTwoColoredTextured(gl);
 	batcher = new spine.webgl.PolygonBatcher(gl);
 	mvp.ortho2d(0, 0, canvas.width - 1, canvas.height - 1);
 	skeletonRenderer = new spine.webgl.SkeletonRenderer(gl);
+	assetManager = new spine.webgl.AssetManager(gl);
+
+	// Create a debug renderer and the ShapeRenderer it needs to render lines.
 	debugRenderer = new spine.webgl.SkeletonDebugRenderer(gl);
 	debugRenderer.drawRegionAttachments = true;
 	debugRenderer.drawBoundingBoxes = true;
@@ -62,9 +66,8 @@ function init () {
 	debugRenderer.drawPaths = true;
 	debugShader = spine.webgl.Shader.newColored(gl);
 	shapes = new spine.webgl.ShapeRenderer(gl);
-	assetManager = new spine.webgl.AssetManager(gl);
 
-	// Tell AssetManager to load the resources for each model, including the exported .skel file, the .atlas file and the .png
+	// Tell AssetManager to load the resources for each skeleton, including the exported .skel file, the .atlas file and the .png
 	// file for the atlas. We then wait until all resources are loaded in the load() method.
 	assetManager.loadBinary("assets/spineboy-pro.skel");
 	assetManager.loadTextureAtlas("assets/spineboy-pma.atlas");
@@ -94,7 +97,8 @@ function load () {
 		skeletons["stretchyman"] = loadSkeleton("stretchyman-pro", "sneak", true);
 		skeletons["coin"] = loadSkeleton("coin-pro", "animation", true);
 		setupUI();
-		requestAnimationFrame(render);
+		lastFrameTime = Date.now() / 1000;
+		requestAnimationFrame(render); // Loading is done, call render every frame.
 	} else {
 		requestAnimationFrame(load);
 	}
@@ -104,22 +108,23 @@ function loadSkeleton (name, initialAnimation, premultipliedAlpha, skin) {
 	if (skin === undefined) skin = "default";
 
 	// Load the texture atlas using name.atlas from the AssetManager.
-	atlas = assetManager.get("assets/" + name.replace("-ess", "").replace("-pro", "") + (premultipliedAlpha ? "-pma": "") + ".atlas");
+	var atlas = assetManager.get("assets/" + name.replace("-ess", "").replace("-pro", "") + (premultipliedAlpha ? "-pma": "") + ".atlas");
 
 	// Create a AtlasAttachmentLoader that resolves region, mesh, boundingbox and path attachments
-	atlasLoader = new spine.AtlasAttachmentLoader(atlas);
+	var atlasLoader = new spine.AtlasAttachmentLoader(atlas);
 
 	// Create a SkeletonBinary instance for parsing the .skel file.
 	var skeletonBinary = new spine.SkeletonBinary(atlasLoader);
 
 	// Set the scale to apply during parsing, parse the file, and create a new skeleton.
+	skeletonBinary.scale = 1;
 	var skeletonData = skeletonBinary.readSkeletonData(assetManager.get("assets/" + name + ".skel"));
 	var skeleton = new spine.Skeleton(skeletonData);
 	skeleton.setSkinByName(skin);
-	var bounds = calculateBounds(skeleton);
+	var bounds = calculateSetupPoseBounds(skeleton);
 
 	// Create an AnimationState, and set the initial animation in looping mode.
-	animationStateData = new spine.AnimationStateData(skeleton.data);
+	var animationStateData = new spine.AnimationStateData(skeleton.data);
 	var animationState = new spine.AnimationState(animationStateData);
 	if (name == "spineboy") {
 		animationStateData.setMix("walk", "jump", 0.4)
@@ -155,7 +160,7 @@ function loadSkeleton (name, initialAnimation, premultipliedAlpha, skin) {
 	return { skeleton: skeleton, state: animationState, bounds: bounds, premultipliedAlpha: premultipliedAlpha };
 }
 
-function calculateBounds(skeleton) {
+function calculateSetupPoseBounds(skeleton) {
 	skeleton.setToSetupPose();
 	skeleton.updateWorldTransform();
 	var offset = new spine.Vector2();
@@ -236,7 +241,6 @@ function setupUI () {
 function render () {
 	var now = Date.now() / 1000;
 	var delta = now - lastFrameTime;
-	delta = 0.016;
 	lastFrameTime = now;
 
 	// Update the MVP matrix to adjust for canvas size changes
@@ -246,8 +250,8 @@ function render () {
 	gl.clear(gl.COLOR_BUFFER_BIT);
 
 	// Apply the animation state based on the delta time.
-	var state = skeletons[activeSkeleton].state;
 	var skeleton = skeletons[activeSkeleton].skeleton;
+	var state = skeletons[activeSkeleton].state;
 	var bounds = skeletons[activeSkeleton].bounds;
 	var premultipliedAlpha = skeletons[activeSkeleton].premultipliedAlpha;
 	state.update(delta);
@@ -269,10 +273,9 @@ function render () {
 		swirlTime += delta;
 		var percent = swirlTime % 2;
 		if (percent > 1) percent = 1 - (percent -1 );
-		// swirlEffect.angle = -60 + 120 * (perecent < 0.5 ? Math.pow(percent * 2, 2) / 2 : Math.pow((percent - 1) * 2, 2) / -2 + 1);
-		swirlEffect.angle = 360 * percent;
-		swirlEffect.centerX = 200; //bounds.offset.x + bounds.size.x / 2
-		swirlEffect.centerY = 200; //bounds.offset.y + bounds.size.y / 2
+		swirlEffect.angle = 120 * percent - 60;
+		swirlEffect.centerX = bounds.offset.x + bounds.size.x / 2;
+		swirlEffect.centerY = bounds.offset.y + bounds.size.y / 2;
 		swirlEffect.radius = Math.sqrt(bounds.size.x * bounds.size.x + bounds.size.y * bounds.size.y);
 		skeletonRenderer.vertexEffect = swirlEffect;
 	} else if (effect == "Jitter") {
@@ -285,7 +288,7 @@ function render () {
 
 	shader.unbind();
 
-	// draw debug information
+	// Draw debug information.
 	var debug = $('#debug').is(':checked');
 	if (debug) {
 		debugShader.bind();
@@ -303,13 +306,13 @@ function render () {
 function resize () {
 	var w = canvas.clientWidth;
 	var h = canvas.clientHeight;
-	var bounds = skeletons[activeSkeleton].bounds;
 	if (canvas.width != w || canvas.height != h) {
 		canvas.width = w;
 		canvas.height = h;
 	}
 
-	// magic
+	// Calculations to center the skeleton in the canvas.
+	var bounds = skeletons[activeSkeleton].bounds;
 	var centerX = bounds.offset.x + bounds.size.x / 2;
 	var centerY = bounds.offset.y + bounds.size.y / 2;
 	var scaleX = bounds.size.x / canvas.width;
@@ -323,9 +326,8 @@ function resize () {
 	gl.viewport(0, 0, canvas.width, canvas.height);
 }
 
-(function() {
-	init();
-})();
+init();
 
 </script>
+</body>
 </html>
\ No newline at end of file
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
index 260a90150..7a0e87cf2 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
@@ -55,7 +55,7 @@ namespace Spine.Unity.Editor {
 			}
 		}
 
-		void OnEnable () {
+		void InitializeEditor () {
 			skeletonRenderer = serializedObject.FindProperty("skeletonRenderer");
 			slotName = serializedObject.FindProperty("slotName");
 			isTrigger = serializedObject.FindProperty("isTrigger");
@@ -64,12 +64,17 @@ namespace Spine.Unity.Editor {
 		}
 
 		public override void OnInspectorGUI () {
+
 			#if !NEW_PREFAB_SYSTEM
 			bool isInspectingPrefab = (PrefabUtility.GetPrefabType(target) == PrefabType.Prefab);
 			#else
 			bool isInspectingPrefab = false;
 			#endif
 
+			// Note: when calling InitializeEditor() in OnEnable, it throws exception
+			// "SerializedObjectNotCreatableException: Object at index 0 is null".
+			InitializeEditor();
+
 			// Try to auto-assign SkeletonRenderer field.
 			if (skeletonRenderer.objectReferenceValue == null) {
 				var foundSkeletonRenderer = follower.GetComponentInParent<SkeletonRenderer>();
@@ -80,6 +85,7 @@ namespace Spine.Unity.Editor {
 
 				skeletonRenderer.objectReferenceValue = foundSkeletonRenderer;
 				serializedObject.ApplyModifiedProperties();
+				InitializeEditor();
 			}
 
 			var skeletonRendererValue = skeletonRenderer.objectReferenceValue as SkeletonRenderer;
@@ -101,6 +107,7 @@ namespace Spine.Unity.Editor {
 			EditorGUILayout.PropertyField(slotName, new GUIContent("Slot"));
 			if (EditorGUI.EndChangeCheck()) {
 				serializedObject.ApplyModifiedProperties();
+				InitializeEditor();
 				#if !NEW_PREFAB_SYSTEM
 				if (!isInspectingPrefab)
 					rebuildRequired = true;
@@ -118,6 +125,7 @@ namespace Spine.Unity.Editor {
 
 				if (clearStateChanged || triggerChanged) {
 					serializedObject.ApplyModifiedProperties();
+					InitializeEditor();
 					if (triggerChanged)
 						foreach (var col in follower.colliderTable.Values)
 							col.isTrigger = isTrigger.boolValue;
@@ -152,6 +160,8 @@ namespace Spine.Unity.Editor {
 
 			}
 
+			if (follower.Slot == null)
+				follower.Initialize(false);
 			bool hasBoneFollower = follower.GetComponent<BoneFollower>() != null;
 			if (!hasBoneFollower) {
 				bool buttonDisabled = follower.Slot == null;
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonAnimationInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonAnimationInspector.cs
index 328766fda..c87ee6262 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonAnimationInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonAnimationInspector.cs
@@ -72,7 +72,9 @@ namespace Spine.Unity.Editor {
 				var component = o as SkeletonAnimation;
 				component.timeScale = Mathf.Max(component.timeScale, 0);
 			}
+
 			EditorGUILayout.Space();
+			SkeletonRootMotionParameter();
 
 			if (!isInspectingPrefab) {
 				if (requireRepaint) {
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
index 97b8235bc..5f9c5942a 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
@@ -33,7 +33,6 @@
 
 using UnityEngine;
 using UnityEditor;
-using Spine;
 
 namespace Spine.Unity.Editor {
 	using Icons = SpineEditorUtilities.Icons;
@@ -44,6 +43,11 @@ namespace Spine.Unity.Editor {
 	public class SkeletonGraphicInspector : UnityEditor.Editor {
 
 		const string SeparatorSlotNamesFieldName = "separatorSlotNames";
+		const string ReloadButtonString = "Reload";
+		protected GUIContent SkeletonDataAssetLabel;
+		static GUILayoutOption reloadButtonWidth;
+		static GUILayoutOption ReloadButtonWidth { get { return reloadButtonWidth = reloadButtonWidth ?? GUILayout.Width(GUI.skin.label.CalcSize(new GUIContent(ReloadButtonString)).x + 20); } }
+		static GUIStyle ReloadButtonStyle { get { return EditorStyles.miniButton; } }
 
 		SerializedProperty material, color;
 		SerializedProperty skeletonDataAsset, initialSkinName;
@@ -56,6 +60,7 @@ namespace Spine.Unity.Editor {
 		SkeletonGraphic thisSkeletonGraphic;
 		protected bool isInspectingPrefab;
 		protected bool slotsReapplyRequired = false;
+		protected bool forceReloadQueued = false;
 
 		protected bool TargetIsValid {
 			get {
@@ -80,6 +85,10 @@ namespace Spine.Unity.Editor {
 #else
 			isInspectingPrefab = (PrefabUtility.GetPrefabType(target) == PrefabType.Prefab);
 #endif
+			SpineEditorUtilities.ConfirmInitialization();
+
+			// Labels
+			SkeletonDataAssetLabel = new GUIContent("SkeletonData Asset", Icons.spine);
 
 			var so = this.serializedObject;
 			thisSkeletonGraphic = target as SkeletonGraphic;
@@ -115,10 +124,34 @@ namespace Spine.Unity.Editor {
 		}
 
 		public override void OnInspectorGUI () {
+
+			if (UnityEngine.Event.current.type == EventType.Layout) {
+				if (forceReloadQueued) {
+					forceReloadQueued = false;
+					foreach (var c in targets) {
+						SpineEditorUtilities.ReloadSkeletonDataAssetAndComponent(c as SkeletonGraphic);
+					}
+				}
+				else {
+					foreach (var c in targets) {
+						var component = c as SkeletonGraphic;
+						if (!component.IsValid) {
+							SpineEditorUtilities.ReinitializeComponent(component);
+							if (!component.IsValid) continue;
+						}
+					}
+				}
+			}
+
 			bool wasChanged = false;
 			EditorGUI.BeginChangeCheck();
 
-			EditorGUILayout.PropertyField(skeletonDataAsset);
+			using (new EditorGUILayout.HorizontalScope(EditorStyles.helpBox)) {
+				SpineInspectorUtility.PropertyFieldFitLabel(skeletonDataAsset, SkeletonDataAssetLabel);
+				if (GUILayout.Button(ReloadButtonString, ReloadButtonStyle, ReloadButtonWidth))
+					forceReloadQueued = true;
+			}
+
 			EditorGUILayout.PropertyField(material);
 			EditorGUILayout.PropertyField(color);
 
@@ -201,6 +234,8 @@ namespace Spine.Unity.Editor {
 			EditorGUILayout.Space();
 			EditorGUILayout.PropertyField(freeze);
 			EditorGUILayout.Space();
+			SkeletonRendererInspector.SkeletonRootMotionParameter(targets);
+			EditorGUILayout.Space();
 			EditorGUILayout.LabelField("UI", EditorStyles.boldLabel);
 			EditorGUILayout.PropertyField(raycastTarget);
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimInspector.cs
index 4ecce5385..65929f084 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimInspector.cs
@@ -30,21 +30,125 @@
 // Contributed by: Mitch Thompson
 
 using UnityEditor;
+using UnityEngine;
 
 namespace Spine.Unity.Editor {
 	[CustomEditor(typeof(SkeletonMecanim))]
 	[CanEditMultipleObjects]
 	public class SkeletonMecanimInspector : SkeletonRendererInspector {
-		protected SerializedProperty mecanimTranslator;
+		public static bool mecanimSettingsFoldout;
+
+		protected SerializedProperty autoReset;
+		protected SerializedProperty useCustomMixMode;
+		protected SerializedProperty layerMixModes;
+		protected SerializedProperty layerBlendModes;
 
 		protected override void OnEnable () {
 			base.OnEnable();
-			mecanimTranslator = serializedObject.FindProperty("translator");
+			SerializedProperty mecanimTranslator = serializedObject.FindProperty("translator");
+			autoReset = mecanimTranslator.FindPropertyRelative("autoReset");
+			useCustomMixMode = mecanimTranslator.FindPropertyRelative("useCustomMixMode");
+			layerMixModes = mecanimTranslator.FindPropertyRelative("layerMixModes");
+			layerBlendModes = mecanimTranslator.FindPropertyRelative("layerBlendModes");
 		}
 
 		protected override void DrawInspectorGUI (bool multi) {
+
+			AddRootMotionComponentIfEnabled();
+
 			base.DrawInspectorGUI(multi);
-			EditorGUILayout.PropertyField(mecanimTranslator, true);
+
+			using (new SpineInspectorUtility.BoxScope()) {
+				mecanimSettingsFoldout = EditorGUILayout.Foldout(mecanimSettingsFoldout, "Mecanim Translator");
+				if (mecanimSettingsFoldout) {
+					EditorGUILayout.PropertyField(autoReset, new GUIContent("Auto Reset",
+						"When set to true, the skeleton state is mixed out to setup-" +
+						"pose when an animation finishes, according to the " +
+						"animation's keyed items."));
+
+					EditorGUILayout.PropertyField(useCustomMixMode, new GUIContent("Custom MixMode",
+						"When disabled, the recommended MixMode is used according to the layer blend mode. Enable to specify a custom MixMode for each Mecanim layer."));
+
+					if (useCustomMixMode.hasMultipleDifferentValues || useCustomMixMode.boolValue == true) {
+						DrawLayerSettings();
+						EditorGUILayout.Space();
+					}
+				}
+			}
+		}
+
+		protected void AddRootMotionComponentIfEnabled () {
+			foreach (var t in targets) {
+				var component = t as Component;
+				var animator = component.GetComponent<Animator>();
+				if (animator != null && animator.applyRootMotion) {
+					if (component.GetComponent<SkeletonMecanimRootMotion>() == null) {
+						component.gameObject.AddComponent<SkeletonMecanimRootMotion>();
+					}
+				}
+			}
+		}
+
+		protected void DrawLayerSettings () {
+			string[] layerNames = GetLayerNames();
+			float widthLayerColumn = 140;
+			float widthMixColumn = 84;
+
+			using (new GUILayout.HorizontalScope()) {
+				var rect = GUILayoutUtility.GetRect(EditorGUIUtility.currentViewWidth, EditorGUIUtility.singleLineHeight);
+				rect.width = widthLayerColumn;
+				EditorGUI.LabelField(rect, SpineInspectorUtility.TempContent("Mecanim Layer"), EditorStyles.boldLabel);
+
+				var savedIndent = EditorGUI.indentLevel;
+				EditorGUI.indentLevel = 0;
+
+				rect.position += new Vector2(rect.width, 0);
+				rect.width = widthMixColumn;
+				EditorGUI.LabelField(rect, SpineInspectorUtility.TempContent("Mix Mode"), EditorStyles.boldLabel);
+
+				EditorGUI.indentLevel = savedIndent;
+			}
+
+			using (new SpineInspectorUtility.IndentScope()) {
+				int layerCount = layerMixModes.arraySize;
+				for (int i = 0; i < layerCount; ++i) {
+					using (new GUILayout.HorizontalScope()) {
+						string layerName = i < layerNames.Length ? layerNames[i] : ("Layer " + i);
+
+						var rect = GUILayoutUtility.GetRect(EditorGUIUtility.currentViewWidth, EditorGUIUtility.singleLineHeight);
+						rect.width = widthLayerColumn;
+						EditorGUI.PrefixLabel(rect, SpineInspectorUtility.TempContent(layerName));
+
+						var savedIndent = EditorGUI.indentLevel;
+						EditorGUI.indentLevel = 0;
+
+						var mixMode = layerMixModes.GetArrayElementAtIndex(i);
+						var blendMode = layerBlendModes.GetArrayElementAtIndex(i);
+						rect.position += new Vector2(rect.width, 0);
+						rect.width = widthMixColumn;
+						EditorGUI.PropertyField(rect, mixMode, GUIContent.none);
+
+						EditorGUI.indentLevel = savedIndent;
+					}
+				}
+			}
+		}
+
+		protected string[] GetLayerNames () {
+			int maxLayerCount = 0;
+			int maxIndex = 0;
+			for (int i = 0; i < targets.Length; ++i) {
+				var skeletonMecanim = ((SkeletonMecanim)targets[i]);
+				int count = skeletonMecanim.Translator.MecanimLayerCount;
+				if (count > maxLayerCount) {
+					maxLayerCount = count;
+					maxIndex = i;
+				}
+			}
+			if (maxLayerCount == 0)
+				return new string[0];
+			var skeletonMecanimMaxLayers = ((SkeletonMecanim)targets[maxIndex]);
+			return skeletonMecanimMaxLayers.Translator.MecanimLayerNames;
 		}
 	}
 }
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs
new file mode 100644
index 000000000..bcdbbaab3
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs
@@ -0,0 +1,81 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEditor;
+using UnityEngine;
+
+namespace Spine.Unity.Editor {
+	[CustomEditor(typeof(SkeletonMecanimRootMotion))]
+	[CanEditMultipleObjects]
+	public class SkeletonMecanimRootMotionInspector : SkeletonRootMotionBaseInspector {
+		protected SerializedProperty mecanimLayerFlags;
+
+		protected GUIContent mecanimLayersLabel;
+
+		protected override void OnEnable () {
+			base.OnEnable();
+			mecanimLayerFlags = serializedObject.FindProperty("mecanimLayerFlags");
+
+			mecanimLayersLabel = new UnityEngine.GUIContent("Mecanim Layers", "Mecanim layers to apply root motion at. Defaults to the first Mecanim layer.");
+		}
+
+		override public void OnInspectorGUI () {
+
+			base.MainPropertyFields();
+			MecanimLayerMaskPropertyField();
+
+			base.OptionalPropertyFields();
+			serializedObject.ApplyModifiedProperties();
+		}
+
+		protected string[] GetLayerNames () {
+			int maxLayerCount = 0;
+			int maxIndex = 0;
+			for (int i = 0; i < targets.Length; ++i) {
+				var skeletonMecanim = ((SkeletonMecanimRootMotion)targets[i]).SkeletonMecanim;
+				int count = skeletonMecanim.Translator.MecanimLayerCount;
+				if (count > maxLayerCount) {
+					maxLayerCount = count;
+					maxIndex = i;
+				}
+			}
+			if (maxLayerCount == 0)
+				return new string[0];
+			var skeletonMecanimMaxLayers = ((SkeletonMecanimRootMotion)targets[maxIndex]).SkeletonMecanim;
+			return skeletonMecanimMaxLayers.Translator.MecanimLayerNames;
+		}
+
+		protected void MecanimLayerMaskPropertyField () {
+			string[] layerNames = GetLayerNames();
+			if (layerNames.Length > 0)
+				mecanimLayerFlags.intValue = EditorGUILayout.MaskField(
+					mecanimLayersLabel, mecanimLayerFlags.intValue, layerNames);
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs.meta b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs.meta
new file mode 100644
index 000000000..04c6dcfc9
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonMecanimRootMotionInspector.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 4613924c50d66cf458f0db803776dd2f
+timeCreated: 1593175106
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
index 15f8d46b8..62f50ed22 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
@@ -82,7 +82,7 @@ namespace Spine.Unity.Editor {
 		const string ReloadButtonString = "Reload";
 		static GUILayoutOption reloadButtonWidth;
 		static GUILayoutOption ReloadButtonWidth { get { return reloadButtonWidth = reloadButtonWidth ?? GUILayout.Width(GUI.skin.label.CalcSize(new GUIContent(ReloadButtonString)).x + 20); } }
-		static GUIStyle ReloadButtonStyle { get { return EditorStyles.miniButtonRight; } }
+		static GUIStyle ReloadButtonStyle { get { return EditorStyles.miniButton; } }
 
 		protected bool TargetIsValid {
 			get {
@@ -106,7 +106,6 @@ namespace Spine.Unity.Editor {
 #else
 			isInspectingPrefab = (PrefabUtility.GetPrefabType(target) == PrefabType.Prefab);
 #endif
-
 			SpineEditorUtilities.ConfirmInitialization();
 
 			// Labels
@@ -173,11 +172,8 @@ namespace Spine.Unity.Editor {
 			if (serializedObject.ApplyModifiedProperties() || SpineInspectorUtility.UndoRedoPerformed(Event.current) ||
 				AreAnyMaskMaterialsMissing()) {
 				if (!Application.isPlaying) {
-					if (multi) {
-						foreach (var o in targets) EditorForceInitializeComponent((SkeletonRenderer)o);
-					} else {
-						EditorForceInitializeComponent((SkeletonRenderer)target);
-					}
+					foreach (var o in targets)
+						SpineEditorUtilities.ReinitializeComponent((SkeletonRenderer)o);
 					SceneView.RepaintAll();
 				}
 			}
@@ -188,25 +184,16 @@ namespace Spine.Unity.Editor {
 			if (Event.current.type == EventType.Layout) {
 				if (forceReloadQueued) {
 					forceReloadQueued = false;
-					if (multi) {
-						foreach (var c in targets)
-							EditorForceReloadSkeletonDataAssetAndComponent(c as SkeletonRenderer);
-					} else {
-						EditorForceReloadSkeletonDataAssetAndComponent(target as SkeletonRenderer);
+					foreach (var c in targets) {
+						SpineEditorUtilities.ReloadSkeletonDataAssetAndComponent(c as SkeletonRenderer);
 					}
 				} else {
-					if (multi) {
-						foreach (var c in targets) {
-							var component = c as SkeletonRenderer;
-							if (!component.valid) {
-								EditorForceInitializeComponent(component);
-								if (!component.valid) continue;
-							}
+					foreach (var c in targets) {
+						var component = c as SkeletonRenderer;
+						if (!component.valid) {
+							SpineEditorUtilities.ReinitializeComponent(component);
+							if (!component.valid) continue;
 						}
-					} else {
-						var component = (SkeletonRenderer)target;
-						if (!component.valid)
-							EditorForceInitializeComponent(component);
 					}
 				}
 
@@ -241,15 +228,8 @@ namespace Spine.Unity.Editor {
 
 #if NO_PREFAB_MESH
 				if (isInspectingPrefab) {
-					if (multi) {
-						foreach (var c in targets) {
-							var component = (SkeletonRenderer)c;
-							MeshFilter meshFilter = component.GetComponent<MeshFilter>();
-							if (meshFilter != null && meshFilter.sharedMesh != null)
-								meshFilter.sharedMesh = null;
-						}
-					} else {
-						var component = (SkeletonRenderer)target;
+					foreach (var c in targets) {
+						var component = (SkeletonRenderer)c;
 						MeshFilter meshFilter = component.GetComponent<MeshFilter>();
 						if (meshFilter != null && meshFilter.sharedMesh != null)
 							meshFilter.sharedMesh = null;
@@ -286,7 +266,7 @@ namespace Spine.Unity.Editor {
 					return;
 				}
 
-				if (!SkeletonDataAssetIsValid(component.skeletonDataAsset)) {
+				if (!SpineEditorUtilities.SkeletonDataAssetIsValid(component.skeletonDataAsset)) {
 					EditorGUILayout.HelpBox("Skeleton Data Asset error. Please check Skeleton Data Asset.", MessageType.Error);
 					return;
 				}
@@ -414,6 +394,48 @@ namespace Spine.Unity.Editor {
 			}
 		}
 
+		protected void SkeletonRootMotionParameter() {
+			SkeletonRootMotionParameter(targets);
+		}
+
+		public static void SkeletonRootMotionParameter(Object[] targets) {
+			int rootMotionComponentCount = 0;
+			foreach (var t in targets) {
+				var component = t as Component;
+				if (component.GetComponent<SkeletonRootMotion>() != null) {
+					++rootMotionComponentCount;
+				}
+			}
+			bool allHaveRootMotion = rootMotionComponentCount == targets.Length;
+			bool anyHaveRootMotion = rootMotionComponentCount > 0;
+
+			using (new GUILayout.HorizontalScope()) {
+				EditorGUILayout.PrefixLabel("Root Motion");
+
+				if (!allHaveRootMotion) {
+					if (GUILayout.Button(SpineInspectorUtility.TempContent("Add Component", Icons.constraintTransform), GUILayout.MaxWidth(130), GUILayout.Height(18))) {
+						foreach (var t in targets) {
+							var component = t as Component;
+							if (component.GetComponent<SkeletonRootMotion>() == null) {
+								component.gameObject.AddComponent<SkeletonRootMotion>();
+							}
+						}
+					}
+				}
+				if (anyHaveRootMotion) {
+					if (GUILayout.Button(SpineInspectorUtility.TempContent("Remove Component", Icons.constraintTransform), GUILayout.MaxWidth(140), GUILayout.Height(18))) {
+						foreach (var t in targets) {
+							var component = t as Component;
+							var rootMotionComponent = component.GetComponent<SkeletonRootMotion>();
+							if (rootMotionComponent  != null) {
+								DestroyImmediate(rootMotionComponent);
+							}
+						}
+					}
+				}
+			}
+		}
+
 		public static void SetSeparatorSlotNames (SkeletonRenderer skeletonRenderer, string[] newSlotNames) {
 			var field = SpineInspectorUtility.GetNonPublicField(typeof(SkeletonRenderer), SeparatorSlotNamesFieldName);
 			field.SetValue(skeletonRenderer, newSlotNames);
@@ -535,38 +557,6 @@ namespace Spine.Unity.Editor {
 			return false;
 		}
 
-		static void EditorForceReloadSkeletonDataAssetAndComponent (SkeletonRenderer component) {
-			if (component == null) return;
-
-			// Clear all and reload.
-			if (component.skeletonDataAsset != null) {
-				foreach (AtlasAssetBase aa in component.skeletonDataAsset.atlasAssets) {
-					if (aa != null) aa.Clear();
-				}
-				component.skeletonDataAsset.Clear();
-			}
-			component.skeletonDataAsset.GetSkeletonData(true);
-
-			// Reinitialize.
-			EditorForceInitializeComponent(component);
-		}
-
-		static void EditorForceInitializeComponent (SkeletonRenderer component) {
-			if (component == null) return;
-			if (!SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
-			component.Initialize(true);
-
-			#if BUILT_IN_SPRITE_MASK_COMPONENT
-			SpineMaskUtilities.EditorAssignSpriteMaskMaterials(component);
-			#endif
-
-			component.LateUpdate();
-		}
-
-		static bool SkeletonDataAssetIsValid (SkeletonDataAsset asset) {
-			return asset != null && asset.GetSkeletonData(quiet: true) != null;
-		}
-
 		bool AreAnyMaskMaterialsMissing() {
 			#if BUILT_IN_SPRITE_MASK_COMPONENT
 			foreach (var o in targets) {
@@ -584,13 +574,13 @@ namespace Spine.Unity.Editor {
 		static void EditorSetMaskMaterials(SkeletonRenderer component, SpriteMaskInteraction maskType)
 		{
 			if (component == null) return;
-			if (!SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
+			if (!SpineEditorUtilities.SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
 			SpineMaskUtilities.EditorInitMaskMaterials(component, component.maskMaterials, maskType);
 		}
 
 		static void EditorDeleteMaskMaterials(SkeletonRenderer component, SpriteMaskInteraction maskType) {
 			if (component == null) return;
-			if (!SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
+			if (!SpineEditorUtilities.SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
 			SpineMaskUtilities.EditorDeleteMaskMaterials(component.maskMaterials, maskType);
 		}
 		#endif
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs
new file mode 100644
index 000000000..dd622e479
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs
@@ -0,0 +1,92 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEditor;
+using UnityEngine;
+
+namespace Spine.Unity.Editor {
+	[CustomEditor(typeof(SkeletonRootMotionBase))]
+	[CanEditMultipleObjects]
+	public class SkeletonRootMotionBaseInspector : UnityEditor.Editor {
+		protected SerializedProperty rootMotionBoneName;
+		protected SerializedProperty transformPositionX;
+		protected SerializedProperty transformPositionY;
+		protected SerializedProperty rigidBody2D;
+		protected SerializedProperty rigidBody;
+
+		protected GUIContent rootMotionBoneNameLabel;
+		protected GUIContent transformPositionXLabel;
+		protected GUIContent transformPositionYLabel;
+		protected GUIContent rigidBody2DLabel;
+		protected GUIContent rigidBodyLabel;
+
+		protected virtual void OnEnable () {
+
+			rootMotionBoneName = serializedObject.FindProperty("rootMotionBoneName");
+			transformPositionX = serializedObject.FindProperty("transformPositionX");
+			transformPositionY = serializedObject.FindProperty("transformPositionY");
+			rigidBody2D = serializedObject.FindProperty("rigidBody2D");
+			rigidBody = serializedObject.FindProperty("rigidBody");
+
+			rootMotionBoneNameLabel = new UnityEngine.GUIContent("Root Motion Bone", "The bone to take the motion from.");
+			transformPositionXLabel = new UnityEngine.GUIContent("X", "Root transform position (X)");
+			transformPositionYLabel = new UnityEngine.GUIContent("Y", "Use the Y-movement of the bone.");
+			rigidBody2DLabel = new UnityEngine.GUIContent("Rigidbody2D",
+				"Optional Rigidbody2D: Assign a Rigidbody2D here if you want " +
+				" to apply the root motion to the rigidbody instead of the Transform." +
+				"\n\n" +
+				"Note that animation and physics updates are not always in sync." +
+				"Some jitter may result at certain framerates.");
+			rigidBodyLabel = new UnityEngine.GUIContent("Rigidbody",
+				"Optional Rigidbody: Assign a Rigidbody here if you want " +
+				" to apply the root motion to the rigidbody instead of the Transform." +
+				"\n\n" +
+				"Note that animation and physics updates are not always in sync." +
+				"Some jitter may result at certain framerates.");
+		}
+
+		public override void OnInspectorGUI () {
+			MainPropertyFields();
+			OptionalPropertyFields();
+			serializedObject.ApplyModifiedProperties();
+		}
+
+		protected virtual void MainPropertyFields () {
+			EditorGUILayout.PropertyField(rootMotionBoneName, rootMotionBoneNameLabel);
+			EditorGUILayout.PropertyField(transformPositionX, transformPositionXLabel);
+			EditorGUILayout.PropertyField(transformPositionY, transformPositionYLabel);
+		}
+
+		protected virtual void OptionalPropertyFields () {
+			//EditorGUILayout.LabelField("Optional", EditorStyles.boldLabel);
+			EditorGUILayout.PropertyField(rigidBody2D, rigidBody2DLabel);
+			EditorGUILayout.PropertyField(rigidBody, rigidBodyLabel);
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs.meta b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs.meta
new file mode 100644
index 000000000..030444885
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionBaseInspector.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: f2cba83baf6afdf44a996e40017c6325
+timeCreated: 1593175106
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs
new file mode 100644
index 000000000..2c9650656
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs
@@ -0,0 +1,79 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEditor;
+using UnityEngine;
+
+namespace Spine.Unity.Editor {
+	[CustomEditor(typeof(SkeletonRootMotion))]
+	[CanEditMultipleObjects]
+	public class SkeletonRootMotionInspector : SkeletonRootMotionBaseInspector {
+		protected SerializedProperty animationTrackFlags;
+		protected GUIContent animationTrackFlagsLabel;
+
+		string[] TrackNames;
+
+		protected override void OnEnable () {
+			base.OnEnable();
+
+			animationTrackFlags = serializedObject.FindProperty("animationTrackFlags");
+			animationTrackFlagsLabel = new UnityEngine.GUIContent("Animation Tracks",
+				"Animation tracks to apply root motion at. Defaults to the first" +
+				" animation track (index 0).");
+		}
+
+		override public void OnInspectorGUI () {
+
+			base.MainPropertyFields();
+			AnimationTracksPropertyField();
+
+			base.OptionalPropertyFields();
+			serializedObject.ApplyModifiedProperties();
+		}
+
+		protected void AnimationTracksPropertyField () {
+
+			if (TrackNames == null) {
+				InitTrackNames();
+
+			}
+
+			animationTrackFlags.intValue = EditorGUILayout.MaskField(
+				animationTrackFlagsLabel, animationTrackFlags.intValue, TrackNames);
+		}
+
+		protected void InitTrackNames () {
+			int numEntries = 32;
+			TrackNames = new string[numEntries];
+			for (int i = 0; i < numEntries; ++i) {
+				TrackNames[i] = string.Format("Track {0}", i);
+			}
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs.meta b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs.meta
new file mode 100644
index 000000000..7c357a899
--- /dev/null
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRootMotionInspector.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: e4836100aed984c4a9af11d39c63cb6b
+timeCreated: 1593183609
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineSpriteShaderGUI.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineSpriteShaderGUI.cs
index 679500e3e..bd1267232 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineSpriteShaderGUI.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineSpriteShaderGUI.cs
@@ -169,7 +169,7 @@ public class SpineSpriteShaderGUI : SpineShaderWithOutlineGUI {
 	static GUIContent _rimPowerText = new GUIContent("Rim Power");
 	static GUIContent _specularToggleText = new GUIContent("Specular", "Enable Specular.");
 	static GUIContent _colorAdjustmentToggleText = new GUIContent("Color Adjustment", "Enable material color adjustment.");
-	static GUIContent _colorAdjustmentColorText = new GUIContent("Overlay Color");
+	static GUIContent _colorAdjustmentColorText = new GUIContent("Overlay Color & Alpha");
 	static GUIContent _colorAdjustmentHueText = new GUIContent("Hue");
 	static GUIContent _colorAdjustmentSaturationText = new GUIContent("Saturation");
 	static GUIContent _colorAdjustmentBrightnessText = new GUIContent("Brightness");
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/SpineEditorUtilities.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/SpineEditorUtilities.cs
index 877cd3ae6..fe841c71c 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/SpineEditorUtilities.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/SpineEditorUtilities.cs
@@ -46,6 +46,10 @@
 #define NEW_PREFERENCES_SETTINGS_PROVIDER
 #endif
 
+#if UNITY_2017_1_OR_NEWER
+#define BUILT_IN_SPRITE_MASK_COMPONENT
+#endif
+
 using UnityEngine;
 using UnityEditor;
 using System.Collections.Generic;
@@ -189,6 +193,62 @@ namespace Spine.Unity.Editor {
 			}
 		}
 
+		public static void ReloadSkeletonDataAssetAndComponent (SkeletonRenderer component) {
+			if (component == null) return;
+			ReloadSkeletonDataAsset(component.skeletonDataAsset);
+			ReinitializeComponent(component);
+		}
+
+		public static void ReloadSkeletonDataAssetAndComponent (SkeletonGraphic component) {
+			if (component == null) return;
+			ReloadSkeletonDataAsset(component.skeletonDataAsset);
+			// Reinitialize.
+			ReinitializeComponent(component);
+		}
+
+		public static void ReloadSkeletonDataAsset (SkeletonDataAsset skeletonDataAsset) {
+			if (skeletonDataAsset != null) {
+				foreach (AtlasAssetBase aa in skeletonDataAsset.atlasAssets) {
+					if (aa != null) aa.Clear();
+				}
+				skeletonDataAsset.Clear();
+			}
+			skeletonDataAsset.GetSkeletonData(true);
+		}
+
+		public static void ReinitializeComponent (SkeletonRenderer component) {
+			if (component == null) return;
+			if (!SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
+
+			var stateComponent = component as IAnimationStateComponent;
+			AnimationState oldAnimationState = null;
+			if (stateComponent != null) {
+				oldAnimationState = stateComponent.AnimationState;
+			}
+
+			component.Initialize(true); // implicitly clears any subscribers
+
+			if (oldAnimationState != null) {
+				stateComponent.AnimationState.AssignEventSubscribersFrom(oldAnimationState);
+			}
+
+		#if BUILT_IN_SPRITE_MASK_COMPONENT
+			SpineMaskUtilities.EditorAssignSpriteMaskMaterials(component);
+		#endif
+			component.LateUpdate();
+		}
+
+		public static void ReinitializeComponent (SkeletonGraphic component) {
+			if (component == null) return;
+			if (!SkeletonDataAssetIsValid(component.SkeletonDataAsset)) return;
+			component.Initialize(true);
+			component.LateUpdate();
+		}
+
+		public static bool SkeletonDataAssetIsValid (SkeletonDataAsset asset) {
+			return asset != null && asset.GetSkeletonData(quiet: true) != null;
+		}
+
 		public static bool IssueWarningsForUnrecommendedTextureSettings(string texturePath)
 		{
 			TextureImporter texImporter = (TextureImporter)TextureImporter.GetAtPath(texturePath);
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonRenderSeparator/Editor/SkeletonRenderSeparatorInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonRenderSeparator/Editor/SkeletonRenderSeparatorInspector.cs
index 9c5fd1bf0..19712597c 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonRenderSeparator/Editor/SkeletonRenderSeparatorInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Modules/SkeletonRenderSeparator/Editor/SkeletonRenderSeparatorInspector.cs
@@ -27,6 +27,10 @@
  * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 using UnityEditor;
 
@@ -81,7 +85,18 @@ namespace Spine.Unity.Examples {
 
 			// Restore mesh part for undo logic after undo of "Add Parts Renderer".
 			// Triggers regeneration and assignment of the mesh filter's mesh.
-			if (component.GetComponent<MeshFilter>() && component.GetComponent<MeshFilter>().sharedMesh == null) {
+
+			bool isMeshFilterAlwaysNull = false;
+			#if UNITY_EDITOR && NEW_PREFAB_SYSTEM
+			// Don't store mesh or material at the prefab, otherwise it will permanently reload
+			var prefabType = UnityEditor.PrefabUtility.GetPrefabAssetType(component);
+			if (UnityEditor.PrefabUtility.IsPartOfPrefabAsset(component) &&
+				(prefabType == UnityEditor.PrefabAssetType.Regular || prefabType == UnityEditor.PrefabAssetType.Variant)) {
+				isMeshFilterAlwaysNull = true;
+			}
+			#endif
+
+			if (!isMeshFilterAlwaysNull && component.GetComponent<MeshFilter>() && component.GetComponent<MeshFilter>().sharedMesh == null) {
 				component.OnDisable();
 				component.OnEnable();
 			}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoundingBoxFollower.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoundingBoxFollower.cs
index 63e5e30d9..570a2cc78 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoundingBoxFollower.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoundingBoxFollower.cs
@@ -106,7 +106,12 @@ namespace Spine.Unity {
 			)
 				return;
 
-			DisposeColliders();
+			slot = null;
+			currentAttachment = null;
+			currentAttachmentName = null;
+			currentCollider = null;
+			colliderTable.Clear();
+			nameTable.Clear();
 
 			var skeleton = skeletonRenderer.skeleton;
 			slot = skeleton.FindSlot(slotName);
@@ -118,13 +123,16 @@ namespace Spine.Unity {
 				return;
 			}
 
+			int requiredCollidersCount = 0;
+			var colliders = GetComponents<PolygonCollider2D>();
 			if (this.gameObject.activeInHierarchy) {
 				foreach (var skin in skeleton.Data.Skins)
-					AddSkin(skin, slotIndex);
+					AddCollidersForSkin(skin, slotIndex, colliders, ref requiredCollidersCount);
 
 				if (skeleton.skin != null)
-					AddSkin(skeleton.skin, slotIndex);
+					AddCollidersForSkin(skeleton.skin, slotIndex, colliders, ref requiredCollidersCount);
 			}
+			DisposeExcessCollidersAfter(requiredCollidersCount);
 
 			if (BoundingBoxFollower.DebugMessages) {
 				bool valid = colliderTable.Count != 0;
@@ -137,7 +145,7 @@ namespace Spine.Unity {
 			}
 		}
 
-		void AddSkin (Skin skin, int slotIndex) {
+		void AddCollidersForSkin (Skin skin, int slotIndex, PolygonCollider2D[] previousColliders, ref int collidersCount) {
 			if (skin == null) return;
 			var skinEntries = new List<Skin.SkinEntry>();
 			skin.GetAttachments(slotIndex, skinEntries);
@@ -151,8 +159,11 @@ namespace Spine.Unity {
 
 				if (boundingBoxAttachment != null) {
 					if (!colliderTable.ContainsKey(boundingBoxAttachment)) {
-						var bbCollider = SkeletonUtility.AddBoundingBoxAsComponent(boundingBoxAttachment, slot, gameObject, isTrigger);
-
+						var bbCollider = collidersCount < previousColliders.Length ?
+							previousColliders[collidersCount] : gameObject.AddComponent<PolygonCollider2D>();
+						++collidersCount;
+						SkeletonUtility.SetColliderPointsLocal(bbCollider, slot, boundingBoxAttachment);
+						bbCollider.isTrigger = isTrigger;
 						bbCollider.enabled = false;
 						bbCollider.hideFlags = HideFlags.NotEditable;
 						bbCollider.isTrigger = IsTrigger;
@@ -178,33 +189,21 @@ namespace Spine.Unity {
 			currentCollider = null;
 		}
 
-		void DisposeColliders () {
+		void DisposeExcessCollidersAfter (int requiredCount) {
 			var colliders = GetComponents<PolygonCollider2D>();
 			if (colliders.Length == 0) return;
 
-			if (Application.isEditor) {
-				if (Application.isPlaying) {
-					foreach (var c in colliders) {
-						if (c != null)
-							Destroy(c);
-					}
-				} else {
-					foreach (var c in colliders)
-						if (c != null)
-							DestroyImmediate(c);
+			for (int i = requiredCount; i < colliders.Length; ++i) {
+				var collider = colliders[i];
+				if (collider != null) {
+#if UNITY_EDITOR
+					if (Application.isEditor && !Application.isPlaying)
+						DestroyImmediate(collider);
+					else
+#endif
+						Destroy(collider);
 				}
-			} else {
-				foreach (PolygonCollider2D c in colliders)
-					if (c != null)
-						Destroy(c);
 			}
-
-			slot = null;
-			currentAttachment = null;
-			currentAttachmentName = null;
-			currentCollider = null;
-			colliderTable.Clear();
-			nameTable.Clear();
 		}
 
 		void LateUpdate () {
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion.meta b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion.meta
new file mode 100644
index 000000000..d8d3bd381
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion.meta
@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: 2b957aa69dae9f948bacdeec549d28ea
+folderAsset: yes
+timeCreated: 1593173800
+licenseType: Pro
+DefaultImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs
new file mode 100644
index 000000000..e49e8a486
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs
@@ -0,0 +1,100 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using System.Collections.Generic;
+using Spine.Unity.AnimationTools;
+
+namespace Spine.Unity {
+
+	/// <summary>
+	/// Add this component to a SkeletonMecanim GameObject
+	/// to turn motion of a selected root bone into Transform or RigidBody motion.
+	/// Local bone translation movement is used as motion.
+	/// All top-level bones of the skeleton are moved to compensate the root
+	/// motion bone location, keeping the distance relationship between bones intact.
+	/// </summary>
+	/// <remarks>
+	/// Only compatible with <c>SkeletonMecanim</c>.
+	/// For <c>SkeletonAnimation</c> or <c>SkeletonGraphic</c> please use
+	/// <see cref="SkeletonRootMotion">SkeletonRootMotion</see> instead.
+	/// </remarks>
+	public class SkeletonMecanimRootMotion : SkeletonRootMotionBase {
+		#region Inspector
+		const int DefaultMecanimLayerFlags = -1;
+		public int mecanimLayerFlags = DefaultMecanimLayerFlags;
+		#endregion
+
+		protected Vector2 movementDelta;
+
+		SkeletonMecanim skeletonMecanim;
+		public SkeletonMecanim SkeletonMecanim {
+			get {
+				return skeletonMecanim ? skeletonMecanim : skeletonMecanim = GetComponent<SkeletonMecanim>();
+			}
+		}
+
+		protected override void Reset () {
+			base.Reset();
+			mecanimLayerFlags = DefaultMecanimLayerFlags;
+		}
+
+		protected override void Start () {
+			base.Start();
+			skeletonMecanim = GetComponent<SkeletonMecanim>();
+			if (skeletonMecanim) {
+				skeletonMecanim.Translator.OnClipApplied -= OnClipApplied;
+				skeletonMecanim.Translator.OnClipApplied += OnClipApplied;
+			}
+		}
+
+		void OnClipApplied(Spine.Animation clip, int layerIndex, float weight,
+				float time, float lastTime, bool playsBackward) {
+
+			if (((mecanimLayerFlags & 1<<layerIndex) == 0) || weight == 0)
+				return;
+
+			var timeline = clip.FindTranslateTimelineForBone(rootMotionBoneIndex);
+			if (timeline != null) {
+				if (!playsBackward)
+					movementDelta += weight * GetTimelineMovementDelta(lastTime, time, timeline, clip);
+				else
+					movementDelta -= weight * GetTimelineMovementDelta(time, lastTime, timeline, clip);
+			}
+		}
+
+		protected override Vector2 CalculateAnimationsMovementDelta () {
+			// Note: movement delta is not gather after animation but
+			// in OnClipApplied after every applied animation.
+			Vector2 result = movementDelta;
+			movementDelta = Vector2.zero;
+			return result;
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs.meta b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs.meta
new file mode 100644
index 000000000..68ec91691
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonMecanimRootMotion.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 95813afe390494344a6ce2cbc8bfb7d1
+timeCreated: 1592849332
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs
new file mode 100644
index 000000000..7d14fb280
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs
@@ -0,0 +1,143 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using System.Collections.Generic;
+using Spine.Unity.AnimationTools;
+
+namespace Spine.Unity {
+
+	/// <summary>
+	/// Add this component to a SkeletonAnimation or SkeletonGraphic GameObject
+	/// to turn motion of a selected root bone into Transform or RigidBody motion.
+	/// Local bone translation movement is used as motion.
+	/// All top-level bones of the skeleton are moved to compensate the root
+	/// motion bone location, keeping the distance relationship between bones intact.
+	/// </summary>
+	/// <remarks>
+	/// Only compatible with SkeletonAnimation (or other components that implement
+	/// ISkeletonComponent, ISkeletonAnimation and IAnimationStateComponent).
+	/// For <c>SkeletonMecanim</c> please use
+	/// <see cref="SkeletonMecanimRootMotion">SkeletonMecanimRootMotion</see> instead.
+	/// </remarks>
+	public class SkeletonRootMotion : SkeletonRootMotionBase {
+		#region Inspector
+		const int DefaultAnimationTrackFlags = -1;
+		public int animationTrackFlags = DefaultAnimationTrackFlags;
+		#endregion
+
+		AnimationState animationState;
+		Canvas canvas;
+
+		protected override float AdditionalScale {
+			get {
+				return canvas ? canvas.referencePixelsPerUnit: 1.0f;
+			}
+		}
+
+		protected override void Reset () {
+			base.Reset();
+			animationTrackFlags = DefaultAnimationTrackFlags;
+		}
+
+		protected override void Start () {
+			base.Start();
+			var animstateComponent = skeletonComponent as IAnimationStateComponent;
+			this.animationState = (animstateComponent != null) ? animstateComponent.AnimationState : null;
+
+			if (this.GetComponent<CanvasRenderer>() != null) {
+				canvas = this.GetComponentInParent<Canvas>();
+			}
+		}
+
+		protected override Vector2 CalculateAnimationsMovementDelta () {
+			Vector2 localDelta = Vector2.zero;
+			int trackCount = animationState.Tracks.Count;
+
+			for (int trackIndex = 0; trackIndex < trackCount; ++trackIndex) {
+				// note: animationTrackFlags != -1 below covers trackIndex >= 32,
+				// with -1 corresponding to entry "everything" of the dropdown list.
+				if (animationTrackFlags != -1 && (animationTrackFlags & 1 << trackIndex) == 0)
+					continue;
+
+				TrackEntry track = animationState.GetCurrent(trackIndex);
+				TrackEntry next = null;
+				while (track != null) {
+					var animation = track.Animation;
+					var timeline = animation.FindTranslateTimelineForBone(rootMotionBoneIndex);
+					if (timeline != null) {
+						var currentDelta = GetTrackMovementDelta(track, timeline, animation, next);
+						localDelta += currentDelta;
+					}
+					// Traverse mixingFrom chain.
+					next = track;
+					track = track.mixingFrom;
+				}
+			}
+			return localDelta;
+		}
+
+		Vector2 GetTrackMovementDelta (TrackEntry track, TranslateTimeline timeline,
+			Animation animation, TrackEntry next) {
+
+			float start = track.animationLast;
+			float end = track.AnimationTime;
+			Vector2 currentDelta = GetTimelineMovementDelta(start, end, timeline, animation);
+
+			ApplyMixAlphaToDelta(ref currentDelta, next, track);
+			return currentDelta;
+		}
+
+		void ApplyMixAlphaToDelta (ref Vector2 currentDelta, TrackEntry next, TrackEntry track) {
+			// Apply mix alpha to the delta position (based on AnimationState.cs).
+			float mix;
+			if (next != null) {
+				if (next.mixDuration == 0) { // Single frame mix to undo mixingFrom changes.
+					mix = 1;
+				}
+				else {
+					mix = next.mixTime / next.mixDuration;
+					if (mix > 1) mix = 1;
+				}
+				float mixAndAlpha = track.alpha * next.interruptAlpha * (1 - mix);
+				currentDelta *= mixAndAlpha;
+			}
+			else {
+				if (track.mixDuration == 0) {
+					mix = 1;
+				}
+				else {
+					mix = track.alpha * (track.mixTime / track.mixDuration);
+					if (mix > 1) mix = 1;
+				}
+				currentDelta *= mix;
+			}
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs.meta b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs.meta
new file mode 100644
index 000000000..bef9e2e4f
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotion.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: f21c9538588898a45a3da22bf4779ab3
+timeCreated: 1591121072
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs
new file mode 100644
index 000000000..5b1e50dbb
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs
@@ -0,0 +1,184 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using System.Collections.Generic;
+using Spine.Unity.AnimationTools;
+
+namespace Spine.Unity {
+
+	/// <summary>
+	/// Base class for skeleton root motion components.
+	/// </summary>
+	abstract public class SkeletonRootMotionBase : MonoBehaviour {
+		#region Inspector
+
+		[SpineBone]
+		[SerializeField]
+		protected string rootMotionBoneName = "root";
+		public bool transformPositionX = true;
+		public bool transformPositionY = true;
+
+		[Header("Optional")]
+		public Rigidbody2D rigidBody2D;
+		public Rigidbody rigidBody;
+
+		public bool UsesRigidbody {
+			get { return rigidBody != null || rigidBody2D != null; }
+		}
+		#endregion
+
+		protected ISkeletonComponent skeletonComponent;
+		protected Bone rootMotionBone;
+		protected int rootMotionBoneIndex;
+		protected List<Bone> topLevelBones = new List<Bone>();
+		protected Vector2 rigidbodyDisplacement;
+
+		protected virtual void Reset () {
+			FindRigidbodyComponent();
+		}
+
+		protected virtual void Start () {
+			skeletonComponent = GetComponent<ISkeletonComponent>();
+			GatherTopLevelBones();
+			SetRootMotionBone(rootMotionBoneName);
+
+			var skeletonAnimation = skeletonComponent as ISkeletonAnimation;
+			if (skeletonAnimation != null)
+				skeletonAnimation.UpdateLocal += HandleUpdateLocal;
+		}
+
+		abstract protected Vector2 CalculateAnimationsMovementDelta ();
+
+		protected virtual float AdditionalScale { get { return 1.0f; } }
+
+		protected Vector2 GetTimelineMovementDelta (float startTime, float endTime,
+			TranslateTimeline timeline, Animation animation) {
+
+			Vector2 currentDelta;
+			if (startTime > endTime) // Looped
+				currentDelta = (timeline.Evaluate(animation.duration) - timeline.Evaluate(startTime))
+					+ (timeline.Evaluate(endTime) - timeline.Evaluate(0));
+			else if (startTime != endTime) // Non-looped
+				currentDelta = timeline.Evaluate(endTime) - timeline.Evaluate(startTime);
+			else
+				currentDelta = Vector2.zero;
+			return currentDelta;
+		}
+
+		void GatherTopLevelBones () {
+			topLevelBones.Clear();
+			var skeleton = skeletonComponent.Skeleton;
+			foreach (var bone in skeleton.Bones) {
+				if (bone.Parent == null)
+					topLevelBones.Add(bone);
+			}
+		}
+
+		public void SetRootMotionBone (string name) {
+			var skeleton = skeletonComponent.Skeleton;
+			int index = skeleton.FindBoneIndex(name);
+			if (index >= 0) {
+				this.rootMotionBoneIndex = index;
+				this.rootMotionBone = skeleton.bones.Items[index];
+			}
+			else {
+				Debug.Log("Bone named \"" + name + "\" could not be found.");
+				this.rootMotionBoneIndex = 0;
+				this.rootMotionBone = skeleton.RootBone;
+			}
+		}
+
+		void HandleUpdateLocal (ISkeletonAnimation animatedSkeletonComponent) {
+			if (!this.isActiveAndEnabled)
+				return; // Root motion is only applied when component is enabled.
+
+			var movementDelta = CalculateAnimationsMovementDelta();
+			AdjustMovementDeltaToConfiguration(ref movementDelta, animatedSkeletonComponent.Skeleton);
+			ApplyRootMotion(movementDelta);
+		}
+
+		void AdjustMovementDeltaToConfiguration (ref Vector2 localDelta, Skeleton skeleton) {
+			if (skeleton.ScaleX < 0) localDelta.x = -localDelta.x;
+			if (skeleton.ScaleY < 0) localDelta.y = -localDelta.y;
+			if (!transformPositionX) localDelta.x = 0f;
+			if (!transformPositionY) localDelta.y = 0f;
+		}
+
+		void ApplyRootMotion (Vector2 localDelta) {
+			localDelta *= AdditionalScale;
+			// Apply root motion to Transform or RigidBody;
+			if (UsesRigidbody) {
+				rigidbodyDisplacement += (Vector2)transform.TransformVector(localDelta);
+				// Accumulated displacement is applied on the next Physics update (FixedUpdate)
+			}
+			else {
+
+				transform.position += transform.TransformVector(localDelta);
+			}
+
+			// Move top level bones in opposite direction of the root motion bone
+			foreach (var topLevelBone in topLevelBones) {
+				if (transformPositionX) topLevelBone.x -= rootMotionBone.x;
+				if (transformPositionY) topLevelBone.y -= rootMotionBone.y;
+			}
+		}
+
+		protected virtual void FixedUpdate () {
+			if (!this.isActiveAndEnabled)
+				return; // Root motion is only applied when component is enabled.
+
+			if(rigidBody2D != null) {
+				rigidBody2D.MovePosition(new Vector2(transform.position.x, transform.position.y)
+					+ rigidbodyDisplacement);
+			}
+			if (rigidBody != null) {
+				rigidBody.MovePosition(transform.position
+					+ new Vector3(rigidbodyDisplacement.x, rigidbodyDisplacement.y, 0));
+			}
+			rigidbodyDisplacement = Vector2.zero;
+		}
+
+		protected virtual void OnDisable () {
+			rigidbodyDisplacement = Vector2.zero;
+		}
+
+		protected void FindRigidbodyComponent () {
+			rigidBody2D = this.GetComponent<Rigidbody2D>();
+			if (!rigidBody2D)
+				rigidBody = this.GetComponent<Rigidbody>();
+
+			if (!rigidBody2D && !rigidBody) {
+				rigidBody2D = this.GetComponentInParent<Rigidbody2D>();
+				if (!rigidBody2D)
+					rigidBody = this.GetComponentInParent<Rigidbody>();
+			}
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs.meta b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs.meta
new file mode 100644
index 000000000..719fd629f
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/RootMotion/SkeletonRootMotionBase.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: fc23a4f220b20024ab0592719f92587d
+timeCreated: 1592849332
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
index 2956a56d6..3ea70fbea 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
@@ -210,6 +210,13 @@ namespace Spine.Unity {
 			if (allowMultipleCanvasRenderers) canvasRenderer.Clear();
 		}
 
+		protected override void OnDisable () {
+			base.OnDisable();
+			foreach (var canvasRenderer in canvasRenderers) {
+				canvasRenderer.Clear();
+			}
+		}
+
 		public virtual void Update () {
 			#if UNITY_EDITOR
 			if (!Application.isPlaying) {
@@ -426,7 +433,7 @@ namespace Spine.Unity {
 				ScaleY = this.initialFlipY ? -1 : 1
 			};
 
-			meshBuffers = new DoubleBuffered<MeshRendererBuffers.SmartMesh>();
+			InitMeshBuffers();
 			baseTexture = skeletonDataAsset.atlasAssets[0].PrimaryMaterial.mainTexture;
 			canvasRenderer.SetTexture(this.mainTexture); // Needed for overwriting initializations.
 
@@ -478,6 +485,16 @@ namespace Spine.Unity {
 		}
 		#endregion
 
+		protected void InitMeshBuffers () {
+			if (meshBuffers != null) {
+				meshBuffers.GetNext().Clear();
+				meshBuffers.GetNext().Clear();
+			}
+			else {
+				meshBuffers = new DoubleBuffered<MeshRendererBuffers.SmartMesh>();
+			}
+		}
+
 		protected void UpdateMeshSingleCanvasRenderer () {
 			if (canvasRenderers.Count > 0)
 				DisableUnusedCanvasRenderers(usedCount : 0);
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonMecanim.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonMecanim.cs
index 71690ec46..6f72be6cc 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonMecanim.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonMecanim.cs
@@ -125,10 +125,17 @@ namespace Spine.Unity {
 		public class MecanimTranslator {
 			#region Inspector
 			public bool autoReset = true;
+			public bool useCustomMixMode = true;
 			public MixMode[] layerMixModes = new MixMode[0];
 			public MixBlend[] layerBlendModes = new MixBlend[0];
 			#endregion
 
+			public delegate void OnClipAppliedDelegate (Spine.Animation clip, int layerIndex, float weight,
+				float time, float lastTime, bool playsBackward);
+			protected event OnClipAppliedDelegate _OnClipApplied;
+
+			public event OnClipAppliedDelegate OnClipApplied { add { _OnClipApplied += value; } remove { _OnClipApplied -= value; } }
+
 			public enum MixMode { AlwaysMix, MixNext, Hard }
 
 			readonly Dictionary<int, Spine.Animation> animationTable = new Dictionary<int, Spine.Animation>(IntEqualityComparer.Instance);
@@ -157,6 +164,26 @@ namespace Spine.Unity {
 			Animator animator;
 			public Animator Animator { get { return this.animator; } }
 
+			public int MecanimLayerCount {
+				get {
+					if (!animator)
+						return 0;
+					return animator.layerCount;
+				}
+			}
+
+			public string[] MecanimLayerNames {
+				get {
+					if (!animator)
+						return new string[0];
+					string[] layerNames = new string[animator.layerCount];
+					for (int i = 0; i < animator.layerCount; ++i) {
+						layerNames[i] = animator.GetLayerName(i);
+					}
+					return layerNames;
+				}
+			}
+
 			public void Initialize(Animator animator, SkeletonDataAsset skeletonDataAsset) {
 				this.animator = animator;
 
@@ -171,24 +198,87 @@ namespace Spine.Unity {
 				ClearClipInfosForLayers();
 			}
 
-			public void Apply (Skeleton skeleton) {
-				if (layerMixModes.Length < animator.layerCount) {
-					System.Array.Resize<MixMode>(ref layerMixModes, animator.layerCount);
-					layerMixModes[animator.layerCount-1] = MixMode.MixNext;
-				}
+			private bool ApplyAnimation (Skeleton skeleton, AnimatorClipInfo info, AnimatorStateInfo stateInfo,
+										int layerIndex, float layerWeight, MixBlend layerBlendMode, bool useClipWeight1 = false) {
+				float weight = info.weight * layerWeight;
+				if (weight == 0)
+					return false;
 
+				var clip = GetAnimation(info.clip);
+				if (clip == null)
+					return false;
+
+				var time = AnimationTime(stateInfo.normalizedTime, info.clip.length,
+										info.clip.isLooping, stateInfo.speed < 0);
+				weight = useClipWeight1 ? layerWeight : weight;
+				clip.Apply(skeleton, 0, time, info.clip.isLooping, null,
+						weight, layerBlendMode, MixDirection.In);
+				if (_OnClipApplied != null)
+					OnClipAppliedCallback(clip, stateInfo, layerIndex, time, info.clip.isLooping, weight);
+				return true;
+			}
+
+			private bool ApplyInterruptionAnimation (Skeleton skeleton,
+				bool interpolateWeightTo1, AnimatorClipInfo info, AnimatorStateInfo stateInfo,
+				int layerIndex, float layerWeight, MixBlend layerBlendMode, float interruptingClipTimeAddition,
+				bool useClipWeight1 = false) {
+
+				float clipWeight = interpolateWeightTo1 ? (info.weight + 1.0f) * 0.5f : info.weight;
+				float weight = clipWeight * layerWeight;
+				if (weight == 0)
+					return false;
+
+				var clip = GetAnimation(info.clip);
+				if (clip == null)
+					return false;
+
+				var time = AnimationTime(stateInfo.normalizedTime + interruptingClipTimeAddition,
+										info.clip.length, stateInfo.speed < 0);
+				weight = useClipWeight1 ? layerWeight : weight;
+				clip.Apply(skeleton, 0, time, info.clip.isLooping, null,
+							weight, layerBlendMode, MixDirection.In);
+				if (_OnClipApplied != null) {
+					OnClipAppliedCallback(clip, stateInfo, layerIndex, time, info.clip.isLooping, weight);
+				}
+				return true;
+			}
+
+			private void OnClipAppliedCallback (Spine.Animation clip, AnimatorStateInfo stateInfo,
+				int layerIndex, float time, bool isLooping, float weight) {
+
+				float clipDuration = clip.duration == 0 ? 1 : clip.duration;
+				float speedFactor = stateInfo.speedMultiplier * stateInfo.speed;
+				float lastTime = time - (Time.deltaTime * speedFactor);
+				if (isLooping && clip.duration != 0) {
+					time %= clip.duration;
+					lastTime %= clip.duration;
+				}
+				_OnClipApplied(clip, layerIndex, weight, time, lastTime, speedFactor < 0);
+			}
+
+			public void Apply (Skeleton skeleton) {
 			#if UNITY_EDITOR
 				if (!Application.isPlaying) {
 					GetLayerBlendModes();
 				}
 			#endif
+
+				if (layerMixModes.Length < animator.layerCount) {
+					int oldSize = layerMixModes.Length;
+					System.Array.Resize<MixMode>(ref layerMixModes, animator.layerCount);
+					for (int layer = oldSize; layer < animator.layerCount; ++layer) {
+						bool isAdditiveLayer = false;
+						if (layer < layerBlendModes.Length)
+							isAdditiveLayer = layerBlendModes[layer] == MixBlend.Add;
+						layerMixModes[layer] = isAdditiveLayer ? MixMode.MixNext : MixMode.AlwaysMix;
+					}
+				}
+
 				InitClipInfosForLayers();
 				for (int layer = 0, n = animator.layerCount; layer < n; layer++) {
 					GetStateUpdatesFromAnimator(layer);
 				}
 
-				//skeleton.Update(Time.deltaTime); // Doesn't actually do anything, currently. (Spine 3.6).
-
 				// Clear Previous
 				if (autoReset) {
 					var previousAnimations = this.previousAnimations;
@@ -257,56 +347,41 @@ namespace Spine.Unity {
 
 					int clipInfoCount, nextClipInfoCount, interruptingClipInfoCount;
 					IList<AnimatorClipInfo> clipInfo, nextClipInfo, interruptingClipInfo;
-					bool shallInterpolateWeightTo1;
+					bool interpolateWeightTo1;
 					GetAnimatorClipInfos(layer, out isInterruptionActive, out clipInfoCount, out nextClipInfoCount, out interruptingClipInfoCount,
-										out clipInfo, out nextClipInfo, out interruptingClipInfo, out shallInterpolateWeightTo1);
+										out clipInfo, out nextClipInfo, out interruptingClipInfo, out interpolateWeightTo1);
 
-					MixMode mode = layerMixModes[layer];
 					MixBlend layerBlendMode = (layer < layerBlendModes.Length) ? layerBlendModes[layer] : MixBlend.Replace;
+					MixMode mode = GetMixMode(layer, layerBlendMode);
 					if (mode == MixMode.AlwaysMix) {
 						// Always use Mix instead of Applying the first non-zero weighted clip.
 						for (int c = 0; c < clipInfoCount; c++) {
-							var info = clipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-							var clip = GetAnimation(info.clip);
-							if (clip != null)
-								clip.Apply(skeleton, 0, AnimationTime(stateInfo.normalizedTime, info.clip.length, info.clip.isLooping, stateInfo.speed < 0), info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+							ApplyAnimation(skeleton, clipInfo[c], stateInfo, layer, layerWeight, layerBlendMode);
 						}
 						if (hasNext) {
 							for (int c = 0; c < nextClipInfoCount; c++) {
-								var info = nextClipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-								var clip = GetAnimation(info.clip);
-								if (clip != null)
-									clip.Apply(skeleton, 0, AnimationTime(nextStateInfo.normalizedTime, info.clip.length, nextStateInfo.speed < 0), info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+								ApplyAnimation(skeleton, nextClipInfo[c], nextStateInfo, layer, layerWeight, layerBlendMode);
 							}
 						}
 						if (isInterruptionActive) {
 							for (int c = 0; c < interruptingClipInfoCount; c++)
 							{
-								var info = interruptingClipInfo[c];
-								float clipWeight = shallInterpolateWeightTo1 ? (info.weight + 1.0f) * 0.5f : info.weight;
-								float weight = clipWeight * layerWeight; if (weight == 0) continue;
-								var clip = GetAnimation(info.clip);
-								if (clip != null)
-									clip.Apply(skeleton, 0, AnimationTime(interruptingStateInfo.normalizedTime + interruptingClipTimeAddition, info.clip.length, interruptingStateInfo.speed < 0),
-																info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+								ApplyInterruptionAnimation(skeleton, interpolateWeightTo1,
+									interruptingClipInfo[c], interruptingStateInfo,
+									layer, layerWeight, layerBlendMode, interruptingClipTimeAddition);
 							}
 						}
 					} else { // case MixNext || Hard
 						// Apply first non-zero weighted clip
 						int c = 0;
 						for (; c < clipInfoCount; c++) {
-							var info = clipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-							var clip = GetAnimation(info.clip);
-							if (clip != null)
-								clip.Apply(skeleton, 0, AnimationTime(stateInfo.normalizedTime, info.clip.length, info.clip.isLooping, stateInfo.speed < 0), info.clip.isLooping, null, 1f, layerBlendMode, MixDirection.In);
+							if (!ApplyAnimation(skeleton, clipInfo[c], stateInfo, layer, layerWeight, layerBlendMode, useClipWeight1:true))
+								continue;
 							++c; break;
 						}
 						// Mix the rest
 						for (; c < clipInfoCount; c++) {
-							var info = clipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-							var clip = GetAnimation(info.clip);
-							if (clip != null)
-								clip.Apply(skeleton, 0, AnimationTime(stateInfo.normalizedTime, info.clip.length, info.clip.isLooping, stateInfo.speed < 0), info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+							ApplyAnimation(skeleton, clipInfo[c], stateInfo, layer, layerWeight, layerBlendMode);
 						}
 
 						c = 0;
@@ -314,19 +389,15 @@ namespace Spine.Unity {
 							// Apply next clip directly instead of mixing (ie: no crossfade, ignores mecanim transition weights)
 							if (mode == MixMode.Hard) {
 								for (; c < nextClipInfoCount; c++) {
-									var info = nextClipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-									var clip = GetAnimation(info.clip);
-									if (clip != null)
-										clip.Apply(skeleton, 0, AnimationTime(nextStateInfo.normalizedTime, info.clip.length, nextStateInfo.speed < 0), info.clip.isLooping, null, 1f, layerBlendMode, MixDirection.In);
+									if (!ApplyAnimation(skeleton, nextClipInfo[c], nextStateInfo, layer, layerWeight, layerBlendMode, useClipWeight1:true))
+										continue;
 									++c; break;
 								}
 							}
 							// Mix the rest
 							for (; c < nextClipInfoCount; c++) {
-								var info = nextClipInfo[c]; float weight = info.weight * layerWeight; if (weight == 0) continue;
-								var clip = GetAnimation(info.clip);
-								if (clip != null)
-									clip.Apply(skeleton, 0, AnimationTime(nextStateInfo.normalizedTime, info.clip.length, nextStateInfo.speed < 0), info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+								if (!ApplyAnimation(skeleton, nextClipInfo[c], nextStateInfo, layer, layerWeight, layerBlendMode))
+									continue;
 							}
 						}
 
@@ -335,23 +406,19 @@ namespace Spine.Unity {
 							// Apply next clip directly instead of mixing (ie: no crossfade, ignores mecanim transition weights)
 							if (mode == MixMode.Hard) {
 								for (; c < interruptingClipInfoCount; c++) {
-									var info = interruptingClipInfo[c];
-									float clipWeight = shallInterpolateWeightTo1 ? (info.weight + 1.0f) * 0.5f : info.weight;
-									float weight = clipWeight * layerWeight; if (weight == 0) continue;
-									var clip = GetAnimation(info.clip);
-									if (clip != null)
-										clip.Apply(skeleton, 0, AnimationTime(interruptingStateInfo.normalizedTime + interruptingClipTimeAddition, info.clip.length, interruptingStateInfo.speed < 0), info.clip.isLooping, null, 1f, layerBlendMode, MixDirection.In);
-									++c; break;
+									if (ApplyInterruptionAnimation(skeleton, interpolateWeightTo1,
+										interruptingClipInfo[c], interruptingStateInfo,
+										layer, layerWeight, layerBlendMode, interruptingClipTimeAddition, useClipWeight1:true)) {
+
+										++c; break;
+									}
 								}
 							}
 							// Mix the rest
 							for (; c < interruptingClipInfoCount; c++) {
-								var info = interruptingClipInfo[c];
-								float clipWeight = shallInterpolateWeightTo1 ? (info.weight + 1.0f) * 0.5f : info.weight;
-								float weight = clipWeight * layerWeight; if (weight == 0) continue;
-								var clip = GetAnimation(info.clip);
-								if (clip != null)
-									clip.Apply(skeleton, 0, AnimationTime(interruptingStateInfo.normalizedTime + interruptingClipTimeAddition, info.clip.length, interruptingStateInfo.speed < 0), info.clip.isLooping, null, weight, layerBlendMode, MixDirection.In);
+								ApplyInterruptionAnimation(skeleton, interpolateWeightTo1,
+									interruptingClipInfo[c], interruptingStateInfo,
+									layer, layerWeight, layerBlendMode, interruptingClipTimeAddition);
 							}
 						}
 					}
@@ -359,9 +426,7 @@ namespace Spine.Unity {
 			}
 
 			static float AnimationTime (float normalizedTime, float clipLength, bool loop, bool reversed) {
-				if (reversed)
-					normalizedTime = (1 - normalizedTime + (int)normalizedTime) + (int)normalizedTime;
-				float time = normalizedTime * clipLength;
+				float time = AnimationTime(normalizedTime, clipLength, reversed);
 				if (loop) return time;
 				const float EndSnapEpsilon = 1f / 30f; // Workaround for end-duration keys not being applied.
 				return (clipLength - time < EndSnapEpsilon) ? clipLength : time; // return a time snapped to clipLength;
@@ -398,7 +463,24 @@ namespace Spine.Unity {
 				}
 			}
 
-		#if UNITY_EDITOR
+			private MixMode GetMixMode (int layer, MixBlend layerBlendMode) {
+				if (useCustomMixMode) {
+					MixMode mode = layerMixModes[layer];
+					// Note: at additive blending it makes no sense to use constant weight 1 at a fadeout anim add1 as
+					// with override layers, so we use AlwaysMix instead to use the proper weights.
+					// AlwaysMix leads to the expected result = lower_layer + lerp(add1, add2, transition_weight).
+					if (layerBlendMode == MixBlend.Add && mode == MixMode.MixNext) {
+						mode = MixMode.AlwaysMix;
+						layerMixModes[layer] = mode;
+					}
+					return mode;
+				}
+				else {
+					return layerBlendMode == MixBlend.Add ? MixMode.AlwaysMix : MixMode.MixNext;
+				}
+			}
+
+#if UNITY_EDITOR
 			void GetLayerBlendModes() {
 				if (layerBlendModes.Length < animator.layerCount) {
 					System.Array.Resize<MixBlend>(ref layerBlendModes, animator.layerCount);
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
index e3b88ccfc..673bd036f 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
@@ -191,8 +191,10 @@ namespace Spine.Unity {
 
 			skeletonRenderer.LateUpdate();
 
-			foreach (var s in partsRenderers)
-				s.ClearMesh();
+			foreach (var partsRenderer in partsRenderers) {
+				if (partsRenderer != null)
+					partsRenderer.ClearMesh();
+			}
 		}
 
 		MaterialPropertyBlock copiedBlock;
@@ -221,6 +223,8 @@ namespace Spine.Unity {
 			int rendererIndex = 0;
 			var currentRenderer = partsRenderers[rendererIndex];
 			for (int si = 0, start = 0; si <= lastSubmeshInstruction; si++) {
+				if (currentRenderer == null)
+					continue;
 				if (submeshInstructionsItems[si].forceSeparate || si == lastSubmeshInstruction) {
 					// Apply properties
 					var meshGenerator = currentRenderer.MeshGenerator;
@@ -245,7 +249,9 @@ namespace Spine.Unity {
 
 			// Clear extra renderers if they exist.
 			for (; rendererIndex < rendererCount; rendererIndex++) {
-				partsRenderers[rendererIndex].ClearMesh();
+				currentRenderer = partsRenderers[rendererIndex];
+				if (currentRenderer != null)
+					partsRenderers[rendererIndex].ClearMesh();
 			}
 
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
index 3e98eef8f..e75c00682 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
@@ -529,7 +529,7 @@ namespace Spine.Unity {
 					separatorSlots.Add(slot);
 				}
 				#if UNITY_EDITOR
-				else
+				else if (!string.IsNullOrEmpty(separatorSlotNames[i]))
 				{
 					Debug.LogWarning(separatorSlotNames[i] + " is not a slot in " + skeletonDataAsset.skeletonJSON.name);
 				}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs
index 153f94e6f..87da59f34 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
@@ -503,7 +503,10 @@ namespace Spine.Unity {
 
 			for (int slotIndex = instruction.startSlot; slotIndex < instruction.endSlot; slotIndex++) {
 				var slot = drawOrderItems[slotIndex];
-				if (!slot.bone.active) continue;
+				if (!slot.bone.active) {
+					clipper.ClipEnd(slot);
+					continue;
+				}
 				var attachment = slot.attachment;
 				float z = zSpacing * slotIndex;
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesPixelLit-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesPixelLit-Outline.shader
index 1cb3e0175..844a990e4 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesPixelLit-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesPixelLit-Outline.shader
@@ -11,8 +11,6 @@ Shader "Spine/Outline/Sprite/Pixel Lit"
 		_BumpMap ("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesUnlit-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesUnlit-Outline.shader
index b687e0130..756f7da33 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesUnlit-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesUnlit-Outline.shader
@@ -8,8 +8,6 @@ Shader "Spine/Outline/Sprite/Unlit"
 		_Color ("Color", Color) = (1,1,1,1)
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_ZWrite ("Depth Write", Float) = 0.0
 		_Cutoff ("Depth alpha cutoff", Range(0,1)) = 0.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesVertexLit-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesVertexLit-Outline.shader
index 3611d7956..6e087dd04 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesVertexLit-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Sprite/SpritesVertexLit-Outline.shader
@@ -11,8 +11,6 @@ Shader "Spine/Outline/Sprite/Vertex Lit"
 		_BumpMap ("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc
index c8918952e..34f8c0b47 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc
@@ -1,7 +1,5 @@
 // Upgrade NOTE: upgraded instancing buffer 'PerDrawSprite' to new syntax.
 
-// Upgrade NOTE: upgraded instancing buffer 'PerDrawSprite' to new syntax.
-
 #ifndef SHADER_SHARED_INCLUDED
 #define SHADER_SHARED_INCLUDED
 
@@ -13,28 +11,6 @@
 #include "UnityCG.cginc"
 #endif
 
-#ifdef UNITY_INSTANCING_ENABLED
-
-    UNITY_INSTANCING_BUFFER_START(PerDrawSprite)
-        // SpriteRenderer.Color while Non-Batched/Instanced.
-        fixed4 unity_SpriteRendererColorArray[UNITY_INSTANCED_ARRAY_SIZE];
-        // this could be smaller but that's how bit each entry is regardless of type
-        float4 unity_SpriteFlipArray[UNITY_INSTANCED_ARRAY_SIZE];
-    UNITY_INSTANCING_BUFFER_END(PerDrawSprite)
-
-    #define _RendererColor unity_SpriteRendererColorArray[unity_InstanceID]
-    #define _Flip unity_SpriteFlipArray[unity_InstanceID]
-
-#endif // instancing
-
-CBUFFER_START(UnityPerDrawSprite)
-#ifndef UNITY_INSTANCING_ENABLED
-    fixed4 _RendererColor;
-    float4 _Flip;
-#endif
-    float _EnableExternalAlpha;
-CBUFFER_END
-
 ////////////////////////////////////////
 // Space functions
 //
@@ -376,11 +352,6 @@ inline fixed4 applyFog(fixed4 pixel, float fogCoordOrFactorAtLWRP)
 
 uniform sampler2D _MainTex;
 
-#if ETC1_EXTERNAL_ALPHA
-//External alpha texture for ETC1 compression
-uniform sampler2D _AlphaTex;
-#endif //ETC1_EXTERNAL_ALPHA
-
 #if _TEXTURE_BLEND
 uniform sampler2D _BlendTex;
 uniform float _BlendAmount;
@@ -401,11 +372,6 @@ inline fixed4 calculateTexturePixel(float2 texcoord)
 	pixel = tex2D(_MainTex, texcoord);
 #endif // !_TEXTURE_BLEND
 
-#if ETC1_EXTERNAL_ALPHA
-    fixed4 alpha = tex2D (_AlphaTex, texcoord);
-    pixel.a = lerp (pixel.a, alpha.r, _EnableExternalAlpha);
-#endif
-
 #if defined(_COLOR_ADJUST)
 	pixel = adjustColor(pixel);
 #endif // _COLOR_ADJUST
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesPixelLit.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesPixelLit.shader
index acd4e5e33..7bdd1ab02 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesPixelLit.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesPixelLit.shader
@@ -9,8 +9,6 @@ Shader "Spine/Sprite/Pixel Lit"
 		_BumpMap ("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesUnlit.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesUnlit.shader
index 66c166055..39ae8d994 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesUnlit.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesUnlit.shader
@@ -6,8 +6,6 @@ Shader "Spine/Sprite/Unlit"
 		_Color ("Color", Color) = (1,1,1,1)
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_ZWrite ("Depth Write", Float) = 0.0
 		_Cutoff ("Depth alpha cutoff", Range(0,1)) = 0.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesVertexLit.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesVertexLit.shader
index b58ad42a5..366e75aef 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesVertexLit.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/SpritesVertexLit.shader
@@ -9,8 +9,6 @@ Shader "Spine/Sprite/Vertex Lit"
 		_BumpMap ("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
index 2ccb7e52d..5aa3f7db3 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/AtlasUtilities.cs
@@ -27,10 +27,16 @@
  * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2019_3_OR_NEWER
+#define CONFIGURABLE_ENTER_PLAY_MODE
+#endif
+
+
 using UnityEngine;
 using System.Collections.Generic;
 using System;
 
+
 namespace Spine.Unity.AttachmentTools {
 
 	public static class AtlasUtilities {
@@ -41,6 +47,14 @@ namespace Spine.Unity.AttachmentTools {
 
 		const int NonrenderingRegion = -1;
 
+	#if CONFIGURABLE_ENTER_PLAY_MODE
+		[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
+		static void Init () {
+			// handle disabled domain reload
+			AtlasUtilities.ClearCache();
+		}
+	#endif
+
 		public static AtlasRegion ToAtlasRegion (this Texture2D t, Material materialPropertySource, float scale = DefaultScale) {
 			return t.ToAtlasRegion(materialPropertySource.shader, scale, materialPropertySource);
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/SkeletonExtensions.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/SkeletonExtensions.cs
index cbca589aa..48020800e 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/SkeletonExtensions.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/SkeletonExtensions.cs
@@ -442,7 +442,7 @@ namespace Spine {
 		}
 	}
 
-	public static class SkeletonExtensions {
+	public static class SpineSkeletonExtensions {
 		public static bool IsWeighted (this VertexAttachment va) {
 			return va.bones != null && va.bones.Length > 0;
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs
new file mode 100644
index 000000000..03f14aa55
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs
@@ -0,0 +1,91 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2020, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using System.Collections.Generic;
+using System.Collections;
+
+namespace Spine.Unity.AnimationTools {
+	public static class TimelineExtensions {
+
+		/// <summary>Evaluates the resulting value of a TranslateTimeline at a given time.
+		/// SkeletonData can be accessed from Skeleton.Data or from SkeletonDataAsset.GetSkeletonData.
+		/// If no SkeletonData is given, values are computed relative to setup pose instead of local-absolute.</summary>
+		public static Vector2 Evaluate (this TranslateTimeline timeline, float time, SkeletonData skeletonData = null) {
+			const int PREV_TIME = -3, PREV_X = -2, PREV_Y = -1;
+			const int X = 1, Y = 2;
+
+			var frames = timeline.frames;
+			if (time < frames[0]) return Vector2.zero;
+
+			float x, y;
+			if (time >= frames[frames.Length - TranslateTimeline.ENTRIES]) { // Time is after last frame.
+				x = frames[frames.Length + PREV_X];
+				y = frames[frames.Length + PREV_Y];
+			}
+			else {
+				// Interpolate between the previous frame and the current frame.
+				int frame = Animation.BinarySearch(frames, time, TranslateTimeline.ENTRIES);
+				x = frames[frame + PREV_X];
+				y = frames[frame + PREV_Y];
+				float frameTime = frames[frame];
+				float percent = timeline.GetCurvePercent(frame / TranslateTimeline.ENTRIES - 1,
+					1 - (time - frameTime) / (frames[frame + PREV_TIME] - frameTime));
+
+				x += (frames[frame + X] - x) * percent;
+				y += (frames[frame + Y] - y) * percent;
+			}
+
+			Vector2 xy = new Vector2(x, y);
+			if (skeletonData == null) {
+				return xy;
+			}
+			else {
+				var boneData = skeletonData.bones.Items[timeline.boneIndex];
+				return xy + new Vector2(boneData.x, boneData.y);
+			}
+		}
+
+		/// <summary>Gets the translate timeline for a given boneIndex.
+		/// You can get the boneIndex using SkeletonData.FindBoneIndex.
+		/// The root bone is always boneIndex 0.
+		/// This will return null if a TranslateTimeline is not found.</summary>
+		public static TranslateTimeline FindTranslateTimelineForBone (this Animation a, int boneIndex) {
+			foreach (var timeline in a.timelines) {
+				if (timeline.GetType().IsSubclassOf(typeof(TranslateTimeline)))
+					continue;
+
+				var translateTimeline = timeline as TranslateTimeline;
+				if (translateTimeline != null && translateTimeline.boneIndex == boneIndex)
+					return translateTimeline;
+			}
+			return null;
+		}
+	}
+}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs.meta b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs.meta
new file mode 100644
index 000000000..6198f84aa
--- /dev/null
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Utility/TimelineExtensions.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 07807fefbff25484ba41b1d16911fb0e
+timeCreated: 1591974498
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.lwrp-shaders/Shaders/Spine-Sprite-LW.shader b/spine-unity/Modules/com.esotericsoftware.spine.lwrp-shaders/Shaders/Spine-Sprite-LW.shader
index aca16c403..6c9bb44db 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.lwrp-shaders/Shaders/Spine-Sprite-LW.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.lwrp-shaders/Shaders/Spine-Sprite-LW.shader
@@ -9,8 +9,6 @@ Shader "Lightweight Render Pipeline/Spine/Sprite"
 		_BumpMap("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-SkeletonLit-URP-2D.shader b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-SkeletonLit-URP-2D.shader
index f129c2a77..7cf903eeb 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-SkeletonLit-URP-2D.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-SkeletonLit-URP-2D.shader
@@ -119,6 +119,7 @@
 			Tags { "LightMode" = "NormalsRendering"}
 
 			Blend SrcAlpha OneMinusSrcAlpha
+			ZWrite Off
 
 			HLSLPROGRAM
 			#pragma prefer_hlslcc gles
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-Sprite-URP-2D.shader b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-Sprite-URP-2D.shader
index 7c42f712d..d9f0ddbb9 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-Sprite-URP-2D.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-Sprite-URP-2D.shader
@@ -10,8 +10,6 @@ Shader "Universal Render Pipeline/2D/Spine/Sprite"
 		_BumpMap("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}
@@ -116,6 +114,7 @@ Shader "Universal Render Pipeline/2D/Spine/Sprite"
 
 			Blend SrcAlpha OneMinusSrcAlpha
 			Cull[_Cull]
+			ZWrite[_ZWrite]
 
 			HLSLPROGRAM
 			#pragma prefer_hlslcc gles
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Spine-Sprite-URP.shader b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Spine-Sprite-URP.shader
index 79402b040..41c3f7aeb 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Spine-Sprite-URP.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Spine-Sprite-URP.shader
@@ -9,8 +9,6 @@ Shader "Universal Render Pipeline/Spine/Sprite"
 		_BumpMap("Normal Map", 2D) = "bump" {}
 
 		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
-		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
-		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
 
 		_EmissionColor("Color", Color) = (0,0,0,0)
 		_EmissionMap("Emission", 2D) = "white" {}