Merge branch '3.7-beta' of https://github.com/esotericsoftware/spine-runtimes into 3.7-beta

spine-as3/spine-as3/src/spine/animation/AnimationState.as

@@ -132,7 +132,8 @@ package spine.animation {
 
 			// Require mixTime > 0 to ensure the mixing from entry was applied at least once.
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				// Require totalAlpha == 0 to ensure mixing is complete, unless mixDuration == 0 (the transition is a single frame).
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					queue.end(from);					

spine-c/spine-c/src/spine/AnimationState.c

@@ -312,7 +312,8 @@ int /*boolean*/ _spAnimationState_updateMixingFrom (spAnimationState* self, spTr
 
 	/* Require mixTime > 0 to ensure the mixing from entry was applied at least once. */
 	if (to->mixTime > 0 && (to->mixTime >= to->mixDuration || to->timeScale == 0)) {
-		if (from->totalAlpha == 0) {
+		/* Require totalAlpha == 0 to ensure mixing is complete, unless mixDuration == 0 (the transition is a single frame). */
+		if (from->totalAlpha == 0 || to->mixDuration == 0) {
 			to->mixingFrom = from->mixingFrom;
 			to->interruptAlpha = from->interruptAlpha;
 			_spEventQueue_end(internal->queue, from);

spine-lua/AnimationState.lua

@@ -346,7 +346,8 @@ function AnimationState:updateMixingFrom (to, delta)
 	
 	-- Require mixTime > 0 to ensure the mixing from entry was applied at least once.
 	if (to.mixTime > 0 and (to.mixTime >= to.mixDuration or to.timeScale == 0)) then
-		if (from.totalAlpha == 0) then
+		-- Require totalAlpha == 0 to ensure mixing is complete, unless mixDuration == 0 (the transition is a single frame).
+		if (from.totalAlpha == 0 or to.mixDuration == 0) then
 			to.mixingFrom = from.mixingFrom
 			to.interruptAlpha = from.interruptAlpha
 			self.queue:_end(from)

spine-ts/build/spine-all.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-all.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/build/spine-canvas.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-canvas.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/build/spine-core.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-core.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/build/spine-threejs.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-threejs.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/build/spine-webgl.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-webgl.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/build/spine-widget.d.ts

@@ -585,6 +585,9 @@ declare module spine {
 		ChainScale = 2,
 	}
 }
+interface Math {
+	fround(n: number): number;
+}
 declare module spine {
 	class SharedAssetManager implements Disposable {
 		private pathPrefix;
@@ -987,6 +990,7 @@ declare module spine {
 		static newFloatArray(size: number): ArrayLike<number>;
 		static newShortArray(size: number): ArrayLike<number>;
 		static toFloatArray(array: Array<number>): number[] | Float32Array;
+		static toSinglePrecision(value: number): number;
 	}
 	class DebugUtils {
 		static logBones(skeleton: Skeleton): void;

spine-ts/build/spine-widget.js

@@ -1216,7 +1216,7 @@ var spine;
 				return true;
 			var finished = this.updateMixingFrom(from, delta);
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);
@@ -2974,6 +2974,15 @@ var spine;
 		RotateMode[RotateMode["ChainScale"] = 2] = "ChainScale";
 	})(RotateMode = spine.RotateMode || (spine.RotateMode = {}));
 })(spine || (spine = {}));
+(function () {
+	if (!Math.fround) {
+		Math.fround = (function (array) {
+			return function (x) {
+				return array[0] = x, array[0];
+			};
+		})(new Float32Array(1));
+	}
+})();
 var spine;
 (function (spine) {
 	var Assets = (function () {
@@ -4745,7 +4754,7 @@ var spine;
 					var eventData = skeletonData.findEvent(eventMap.name);
 					if (eventData == null)
 						throw new Error("Event not found: " + eventMap.name);
-					var event_5 = new spine.Event(eventMap.time, eventData);
+					var event_5 = new spine.Event(spine.Utils.toSinglePrecision(eventMap.time), eventData);
 					event_5.intValue = this.getValue(eventMap, "int", eventData.intValue);
 					event_5.floatValue = this.getValue(eventMap, "float", eventData.floatValue);
 					event_5.stringValue = this.getValue(eventMap, "string", eventData.stringValue);
@@ -5879,6 +5888,9 @@ var spine;
 		Utils.toFloatArray = function (array) {
 			return Utils.SUPPORTS_TYPED_ARRAYS ? new Float32Array(array) : array;
 		};
+		Utils.toSinglePrecision = function (value) {
+			return Utils.SUPPORTS_TYPED_ARRAYS ? Math.fround(value) : value;
+		};
 		return Utils;
 	}());
 	Utils.SUPPORTS_TYPED_ARRAYS = typeof (Float32Array) !== "undefined";

spine-ts/core/src/AnimationState.ts

@@ -116,7 +116,8 @@ module spine {
 
 			// Require mixTime > 0 to ensure the mixing from entry was applied at least once.
 			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
-				if (from.totalAlpha == 0) {
+				// Require totalAlpha == 0 to ensure mixing is complete, unless mixDuration == 0 (the transition is a single frame).
+				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
 					to.interruptAlpha = from.interruptAlpha;
 					this.queue.end(from);

spine-unity/Assets/spine-unity/Editor/SkeletonRendererInspector.cs

@@ -170,7 +170,7 @@ namespace Spine.Unity.Editor {
 					#if NO_PREFAB_MESH
 					if (isInspectingPrefab) {
 						MeshFilter meshFilter = component.GetComponent<MeshFilter>();
-						if (meshFilter != null)
+						if (meshFilter != null && meshFilter.sharedMesh != null)
 							meshFilter.sharedMesh = null;
 					}
 					#endif
@@ -211,7 +211,7 @@ namespace Spine.Unity.Editor {
 				#if NO_PREFAB_MESH
 				if (isInspectingPrefab) {
 					MeshFilter meshFilter = component.GetComponent<MeshFilter>();
-					if (meshFilter != null)
+					if (meshFilter != null && meshFilter.sharedMesh != null)
 						meshFilter.sharedMesh = null;
 				}
 				#endif

spine-unity/Assets/spine-unity/Modules/AttachmentTools/AttachmentTools.cs

@@ -726,16 +726,16 @@ namespace Spine.Unity.Modules.AttachmentTools {
 
 		/// <summary>Adds an attachment to the skin for the specified slot index and name. If the name already exists for the slot, the previous value is replaced.</summary>
 		public static void SetAttachment (this Skin skin, string slotName, string keyName, Attachment attachment, Skeleton skeleton) {
-			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (skeleton == null) throw new System.ArgumentNullException("skeleton", "skeleton cannot be null.");
+			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (slotIndex == -1) throw new System.ArgumentException(string.Format("Slot '{0}' does not exist in skeleton.", slotName), "slotName");
 			skin.AddAttachment(slotIndex, keyName, attachment);
 		}
 
 		/// <summary>Gets an attachment from the skin for the specified slot index and name.</summary>
 		public static Attachment GetAttachment (this Skin skin, string slotName, string keyName, Skeleton skeleton) {
-			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (skeleton == null) throw new System.ArgumentNullException("skeleton", "skeleton cannot be null.");
+			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (slotIndex == -1) throw new System.ArgumentException(string.Format("Slot '{0}' does not exist in skeleton.", slotName), "slotName");
 			return skin.GetAttachment(slotIndex, keyName);
 		}
@@ -747,8 +747,8 @@ namespace Spine.Unity.Modules.AttachmentTools {
 
 		/// <summary>Removes the attachment. Returns true if the element is successfully found and removed; otherwise, false.</summary>
 		public static bool RemoveAttachment (this Skin skin, string slotName, string keyName, Skeleton skeleton) {
-			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (skeleton == null) throw new System.ArgumentNullException("skeleton", "skeleton cannot be null.");
+			int slotIndex = skeleton.FindSlotIndex(slotName);
 			if (slotIndex == -1) throw new System.ArgumentException(string.Format("Slot '{0}' does not exist in skeleton.", slotName), "slotName");
 			return skin.RemoveAttachment(slotIndex, keyName);
 		}

spine-unity/Assets/spine-unity/Modules/SkeletonRenderSeparator/SkeletonRenderSeparator.cs

@@ -72,6 +72,14 @@ namespace Spine.Unity.Modules {
 		#endregion
 
 		#region Runtime Instantiation
+		/// <summary>Adds a SkeletonRenderSeparator and child SkeletonPartsRenderer GameObjects to a given SkeletonRenderer.</summary>
+		/// <returns>The to skeleton renderer.</returns>
+		/// <param name="skeletonRenderer">The target SkeletonRenderer or SkeletonAnimation.</param>
+		/// <param name="sortingLayerID">Sorting layer to be used for the parts renderers.</param>
+		/// <param name="extraPartsRenderers">Number of additional SkeletonPartsRenderers on top of the ones determined by counting the number of separator slots.</param>
+		/// <param name="sortingOrderIncrement">The integer to increment the sorting order per SkeletonPartsRenderer to separate them.</param>
+		/// <param name="baseSortingOrder">The sorting order value of the first SkeletonPartsRenderer.</param>
+		/// <param name="addMinimumPartsRenderers">If set to <c>true</c>, a minimum number of SkeletonPartsRenderer GameObjects (determined by separatorSlots.Count + 1) will be added.</param>
 		public static SkeletonRenderSeparator AddToSkeletonRenderer (SkeletonRenderer skeletonRenderer, int sortingLayerID = 0, int extraPartsRenderers = 0, int sortingOrderIncrement = DefaultSortingOrderIncrement, int baseSortingOrder = 0, bool addMinimumPartsRenderers = true) {
 			if (skeletonRenderer == null) {
 				Debug.Log("Tried to add SkeletonRenderSeparator to a null SkeletonRenderer reference.");
@@ -90,15 +98,34 @@ namespace Spine.Unity.Modules {
 			var componentRenderers = srs.partsRenderers;
 
 			for (int i = 0; i < count; i++) {
-				var smr = SkeletonPartsRenderer.NewPartsRendererGameObject(skeletonRendererTransform, i.ToString());
-				var mr = smr.MeshRenderer;
+				var spr = SkeletonPartsRenderer.NewPartsRendererGameObject(skeletonRendererTransform, i.ToString());
+				var mr = spr.MeshRenderer;
 				mr.sortingLayerID = sortingLayerID;
 				mr.sortingOrder = baseSortingOrder + (i * sortingOrderIncrement);
-				componentRenderers.Add(smr);
+				componentRenderers.Add(spr);
 			}
 
 			return srs;
 		}
+
+		/// <summary>Add a child SkeletonPartsRenderer GameObject to this SkeletonRenderSeparator.</summary>
+		public void AddPartsRenderer (int sortingOrderIncrement = DefaultSortingOrderIncrement) {
+			int sortingLayerID = 0;
+			int sortingOrder = 0;
+			if (partsRenderers.Count > 0) {
+				var previous = partsRenderers[partsRenderers.Count - 1];
+				var previousMeshRenderer = previous.MeshRenderer;
+				sortingLayerID = previousMeshRenderer.sortingLayerID;
+				sortingOrder = previousMeshRenderer.sortingOrder + sortingOrderIncrement;
+			}
+				
+			var spr = SkeletonPartsRenderer.NewPartsRendererGameObject(skeletonRenderer.transform, partsRenderers.Count.ToString());
+			partsRenderers.Add(spr);
+
+			var mr = spr.MeshRenderer;
+			mr.sortingLayerID = sortingLayerID;
+			mr.sortingOrder = sortingOrder;
+		}
 		#endregion
 
 		void OnEnable () {