diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3d695cea..f57f3cbfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -169,6 +169,7 @@
   - SkeletonMecanim: Added `Scene Preview` option to preview an Animation Clip for e.g. easier event placement. When enabled, the Animation Clip selected in the Animation window is previewed in the Scene and Game views. Lock the `SkeletonMecanim` Inspector window, open the Animation window and select the Animation Clip. Then in the Animation window scrub through the timeline to see the current animation frame previewed.
   - `Universal Render Pipeline/Spine/Skeleton Lit` shader now supports [Adaptive Probe Volumes (APV)](https://docs.unity3d.com/6000.0/Documentation/Manual/urp/probevolumes-concept.html) introduced in Unity 6. The shader also provides a new material property `APV per Pixel` to either calculate APV lighting contribution per pixel (the default) or per vertex.
   - `Universal Render Pipeline/Spine/Sprite` shader now also supports [Adaptive Probe Volumes (APV)](https://docs.unity3d.com/6000.0/Documentation/Manual/urp/probevolumes-concept.html) introduced in Unity 6. APV lighting contribution is automatically calculated per pixel.
+  - All Spine Outline shaders, including the URP outline shaders, now provide an additional parameter `Fill`. Enable it to also fill the opaque area inside the outline with the outline color. Prevents a semi-transparent gap between outline and skeleton. Defaults to `disabled` to maintain existing behaviour.
 
 - **Breaking changes**
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineShaderWithOutlineGUI.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineShaderWithOutlineGUI.cs
index effb6d9ef..9d4c6d367 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineShaderWithOutlineGUI.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Shaders/SpineShaderWithOutlineGUI.cs
@@ -41,6 +41,7 @@ public class SpineShaderWithOutlineGUI : ShaderGUI {
 	MaterialProperty _OutlineWidth = null;
 	MaterialProperty _UseScreenSpaceOutlineWidth = null;
 	MaterialProperty _OutlineColor = null;
+	MaterialProperty _Fill = null;
 	MaterialProperty _OutlineReferenceTexWidth = null;
 	MaterialProperty _ThresholdEnd = null;
 	MaterialProperty _OutlineSmoothness = null;
@@ -54,6 +55,7 @@ public class SpineShaderWithOutlineGUI : ShaderGUI {
 	static GUIContent _OutlineWidthText = new GUIContent("Outline Width", "");
 	static GUIContent _UseScreenSpaceOutlineWidthText = new GUIContent("Width in Screen Space", "Enable to keep the outline width constant in screen space instead of texture space. Requires more expensive computations.");
 	static GUIContent _OutlineColorText = new GUIContent("Outline Color", "");
+	static GUIContent _FillText = new GUIContent("Fill", "Enable to also fill the opaque area inside the outline with the outline color. Prevents a semi-transparent gap between outline and skeleton.");
 	static GUIContent _OutlineReferenceTexWidthText = new GUIContent("Reference Texture Width", "");
 	static GUIContent _ThresholdEndText = new GUIContent("Outline Threshold", "");
 	static GUIContent _OutlineSmoothnessText = new GUIContent("Outline Smoothness", "");
@@ -92,6 +94,7 @@ public class SpineShaderWithOutlineGUI : ShaderGUI {
 		_UseScreenSpaceOutlineWidth = FindProperty("_UseScreenSpaceOutlineWidth", props, false);
 		_OutlineReferenceTexWidth = FindProperty("_OutlineReferenceTexWidth", props, false);
 		_OutlineColor = FindProperty("_OutlineColor", props, false);
+		_Fill = FindProperty("_Fill", props, false);
 		_ThresholdEnd = FindProperty("_ThresholdEnd", props, false);
 		_OutlineSmoothness = FindProperty("_OutlineSmoothness", props, false);
 		_Use8Neighbourhood = FindProperty("_Use8Neighbourhood", props, false);
@@ -157,6 +160,8 @@ public class SpineShaderWithOutlineGUI : ShaderGUI {
 			if (_UseScreenSpaceOutlineWidth != null)
 				_materialEditor.ShaderProperty(_UseScreenSpaceOutlineWidth, _UseScreenSpaceOutlineWidthText);
 			_materialEditor.ShaderProperty(_OutlineColor, _OutlineColorText);
+			if (_Fill != null)
+				_materialEditor.ShaderProperty(_Fill, _FillText);
 
 			_showAdvancedOutlineSettings = EditorGUILayout.Foldout(_showAdvancedOutlineSettings, _OutlineAdvancedText);
 			if (_showAdvancedOutlineSettings) {
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Additive.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Additive.shader
index 7da343e05..a9cb2cbc3 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Additive.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Additive.shader
@@ -18,6 +18,7 @@ Shader "Spine/Blend Modes/Skeleton PMA Additive" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Multiply.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Multiply.shader
index 0454ffcfb..574facd0d 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Multiply.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Multiply.shader
@@ -18,6 +18,7 @@ Shader "Spine/Blend Modes/Skeleton PMA Multiply" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Screen.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Screen.shader
index b39c9cf7e..53298c69c 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Screen.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Screen.shader
@@ -18,6 +18,7 @@ Shader "Spine/Blend Modes/Skeleton PMA Screen" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc
index ae3763848..f82ce6e09 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc
@@ -46,8 +46,13 @@ float4 computeOutlinePixel(sampler2D mainTexture, float2 mainTextureTexelSize,
 	float average = (pixelTop + pixelBottom + pixelLeft + pixelRight) * vertexColorAlpha / numSamples;
 #endif
 	float thresholdStart = ThresholdEnd * (1.0 - OutlineSmoothness);
-	float outlineAlpha = saturate(saturate((average - thresholdStart) / (ThresholdEnd - thresholdStart)) - pixelCenter);
-	outlineAlpha = pixelCenter > OutlineOpaqueAlpha ? 0 : outlineAlpha;
+	float outlineAlpha = saturate((average - thresholdStart) / (ThresholdEnd - thresholdStart));
+#if !_OUTLINE_FILL_INSIDE
+	outlineAlpha = saturate(outlineAlpha - pixelCenter);
+	outlineAlpha = pixelCenter > OutlineOpaqueAlpha ? 0.0 : outlineAlpha;
+#else
+	outlineAlpha = pixelCenter > OutlineOpaqueAlpha ? 1.0 : outlineAlpha;
+#endif
 	return lerp(texColor, OutlineColor, outlineAlpha);
 }
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Additive-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Additive-Outline.shader
index 56a176967..d4cb13fc3 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Additive-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Additive-Outline.shader
@@ -13,6 +13,7 @@ Shader "Spine/Outline/Blend Modes/Skeleton PMA Additive" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Multiply-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Multiply-Outline.shader
index c008d45a1..9c1fd3ed5 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Multiply-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Multiply-Outline.shader
@@ -13,6 +13,7 @@ Shader "Spine/Outline/Blend Modes/Skeleton PMA Multiply" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Screen-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Screen-Outline.shader
index cdd7bd7ca..07b8edcee 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Screen-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/BlendModes/Spine-Skeleton-PMA-Screen-Outline.shader
@@ -13,6 +13,7 @@ Shader "Spine/Outline/Blend Modes/Skeleton PMA Screen" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-Outline.shader
index b899d9d03..6ef6cb083 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-Outline.shader
@@ -23,6 +23,7 @@ Shader "Spine/Outline/SkeletonGraphic"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-TintBlack-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-TintBlack-Outline.shader
index 51647cb3f..3ab6749de 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-TintBlack-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/SkeletonGraphic/Spine-SkeletonGraphic-TintBlack-Outline.shader
@@ -25,6 +25,7 @@ Shader "Spine/Outline/SkeletonGraphic Tint Black"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Fill-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Fill-Outline.shader
index 0c00f2368..1c3da7f93 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Fill-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Fill-Outline.shader
@@ -14,6 +14,7 @@ Shader "Spine/Outline/Skeleton Fill" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-Outline.shader
index 358b6b79a..ccdc0a8be 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-Outline.shader
@@ -13,6 +13,7 @@ Shader "Spine/Outline/Skeleton Lit" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-ZWrite-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-ZWrite-Outline.shader
index 055c6fa71..195fe8c75 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-ZWrite-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Lit-ZWrite-Outline.shader
@@ -14,6 +14,7 @@ Shader "Spine/Outline/Skeleton Lit ZWrite" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Outline.shader
index ab5e01914..4e6aed0b8 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Outline.shader
@@ -12,6 +12,7 @@ Shader "Spine/Outline/Skeleton" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
@@ -42,6 +43,7 @@ Shader "Spine/Outline/Skeleton" {
 			#pragma fragment fragOutline
 			#pragma shader_feature _ _USE8NEIGHBOURHOOD_ON
 			#pragma shader_feature _ _USE_SCREENSPACE_OUTLINE_WIDTH
+			#pragma shader_feature _ _OUTLINE_FILL_INSIDE
 			#include "CGIncludes/Spine-Outline-Pass.cginc"
 			ENDCG
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader
index 16743f185..e1f7c0390 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader
@@ -11,6 +11,7 @@ Shader "Spine/Outline/OutlineOnly-ZWrite" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
@@ -56,6 +57,7 @@ Shader "Spine/Outline/OutlineOnly-ZWrite" {
 			#pragma fragment fragOutline
 			#pragma shader_feature _ _USE8NEIGHBOURHOOD_ON
 			#pragma shader_feature _ _USE_SCREENSPACE_OUTLINE_WIDTH
+			#pragma shader_feature _ _OUTLINE_FILL_INSIDE
 			#include "CGIncludes/Spine-Outline-Pass.cginc"
 			ENDCG
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Tint-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Tint-Outline.shader
index c9d179a30..c0a87690a 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Tint-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-Tint-Outline.shader
@@ -14,6 +14,7 @@ Shader "Spine/Outline/Skeleton Tint" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-TintBlack-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-TintBlack-Outline.shader
index 7b608ac9e..7edad607e 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-TintBlack-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-TintBlack-Outline.shader
@@ -14,6 +14,7 @@ Shader "Spine/Outline/Skeleton Tint Black" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Special-Skeleton-Grayscale-Outline.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Special-Skeleton-Grayscale-Outline.shader
index eaf9ca60a..de6c1c901 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Special-Skeleton-Grayscale-Outline.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Special-Skeleton-Grayscale-Outline.shader
@@ -13,6 +13,7 @@ Shader "Spine/Outline/Special/Skeleton Grayscale" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 ce6a98166..91c172e17 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
@@ -50,6 +50,7 @@ Shader "Spine/Outline/Sprite/Pixel Lit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 64a6805cb..28a73a100 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
@@ -33,6 +33,7 @@ Shader "Spine/Outline/Sprite/Unlit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 7ca7fdf5d..2ff861430 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
@@ -51,6 +51,7 @@ Shader "Spine/Outline/Sprite/Vertex Lit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Additive.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Additive.shader
index a90833f3c..6d0862f07 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Additive.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Additive.shader
@@ -23,6 +23,7 @@ Shader "Spine/SkeletonGraphic Additive"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Fill.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Fill.shader
index 53078f062..dbc3dc3a9 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Fill.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Fill.shader
@@ -23,6 +23,7 @@ Shader "Spine/SkeletonGraphic Fill"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Grayscale.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Grayscale.shader
index dc8cfe0d2..6499e4f7c 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Grayscale.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Grayscale.shader
@@ -21,6 +21,7 @@ Shader "Spine/SkeletonGraphic Grayscale"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Multiply.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Multiply.shader
index 4e6fde069..5ebecc1ee 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Multiply.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Multiply.shader
@@ -23,6 +23,7 @@ Shader "Spine/SkeletonGraphic Multiply"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Screen.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Screen.shader
index b25c69c8d..e7953b944 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Screen.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Screen.shader
@@ -23,6 +23,7 @@ Shader "Spine/SkeletonGraphic Screen"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic.shader
index 82a377d26..0932e5e34 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic.shader
@@ -23,6 +23,7 @@ Shader "Spine/SkeletonGraphic"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Additive.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Additive.shader
index 3bd624f81..b569b7663 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Additive.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Additive.shader
@@ -24,6 +24,7 @@ Shader "Spine/SkeletonGraphic Tint Black Additive"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Multiply.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Multiply.shader
index 61987b1b9..a5285776b 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Multiply.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Multiply.shader
@@ -24,6 +24,7 @@ Shader "Spine/SkeletonGraphic Tint Black Multiply"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Screen.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Screen.shader
index c1a4c2518..56e0ed5a0 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Screen.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack-Screen.shader
@@ -24,6 +24,7 @@ Shader "Spine/SkeletonGraphic Tint Black Screen"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack.shader
index 6babb5895..678ac9a38 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/TintBlack/Spine-SkeletonGraphic-TintBlack.shader
@@ -24,6 +24,7 @@ Shader "Spine/SkeletonGraphic Tint Black"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Fill.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Fill.shader
index a7669c8e0..af7ba9c49 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Fill.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Fill.shader
@@ -16,6 +16,7 @@ Shader "Spine/Skeleton Fill" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit-ZWrite.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit-ZWrite.shader
index b0c57acd0..2f33d2f2a 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit-ZWrite.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit-ZWrite.shader
@@ -17,6 +17,7 @@ Shader "Spine/Skeleton Lit ZWrite" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit.shader
index f3d10ee03..f01806f93 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Lit.shader
@@ -16,6 +16,7 @@ Shader "Spine/Skeleton Lit" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Tint.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Tint.shader
index 56feb518e..424dcf6da 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Tint.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-Tint.shader
@@ -19,6 +19,7 @@ Shader "Spine/Skeleton Tint" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-TintBlack.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-TintBlack.shader
index 4fbbbbba2..32883491c 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-TintBlack.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-TintBlack.shader
@@ -21,6 +21,7 @@ Shader "Spine/Skeleton Tint Black" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton.shader
index 304de737e..708a50a01 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton.shader
@@ -10,6 +10,7 @@ Shader "Spine/Skeleton" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Special-Skeleton-Grayscale.shader b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Special-Skeleton-Grayscale.shader
index 367808693..a2f361880 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Special-Skeleton-Grayscale.shader
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Special-Skeleton-Grayscale.shader
@@ -15,6 +15,7 @@ Shader "Spine/Special/Skeleton Grayscale" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 1dbe6efae..8910d40c6 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
@@ -52,6 +52,7 @@ Shader "Spine/Sprite/Pixel Lit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 7549dd85e..124586ea1 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
@@ -34,6 +34,7 @@ Shader "Spine/Sprite/Unlit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
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 cd15a4e4e..45e8f7a81 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
@@ -53,6 +53,7 @@ Shader "Spine/Sprite/Vertex Lit"
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
diff --git a/spine-unity/Assets/Spine/package.json b/spine-unity/Assets/Spine/package.json
index ac683c326..6ee911457 100644
--- a/spine-unity/Assets/Spine/package.json
+++ b/spine-unity/Assets/Spine/package.json
@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.spine-unity",
 	"displayName": "spine-unity Runtime",
 	"description": "This plugin provides the spine-unity runtime core.",
-	"version": "4.2.98",
+	"version": "4.2.99",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-URP.shader b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-URP.shader
index 482cb890f..b3cf2acbe 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-URP.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-URP.shader
@@ -8,6 +8,7 @@ Shader "Universal Render Pipeline/Spine/Outline/Skeleton-OutlineOnly" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
@@ -46,6 +47,7 @@ Shader "Universal Render Pipeline/Spine/Outline/Skeleton-OutlineOnly" {
 			#pragma fragment fragOutline
 			#pragma shader_feature _ _USE8NEIGHBOURHOOD_ON
 			#pragma shader_feature _ _USE_SCREENSPACE_OUTLINE_WIDTH
+			#pragma shader_feature _ _OUTLINE_FILL_INSIDE
 
 			#define USE_URP
 			#define fixed4 half4
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite-URP.shader b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite-URP.shader
index 7c1c03b6b..55375ff65 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite-URP.shader
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite-URP.shader
@@ -9,6 +9,7 @@ Shader "Universal Render Pipeline/Spine/Outline/Skeleton-OutlineOnly ZWrite" {
 		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
 		[HideInInspector][MaterialToggle(_USE_SCREENSPACE_OUTLINE_WIDTH)] _UseScreenSpaceOutlineWidth("Width in Screen Space", Float) = 0
 		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector][MaterialToggle(_OUTLINE_FILL_INSIDE)]_Fill("Fill", Float) = 0
 		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
 		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
 		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
@@ -50,6 +51,7 @@ Shader "Universal Render Pipeline/Spine/Outline/Skeleton-OutlineOnly ZWrite" {
  			#pragma fragment fragOutline
  			#pragma shader_feature _ _USE8NEIGHBOURHOOD_ON
 			#pragma shader_feature _ _USE_SCREENSPACE_OUTLINE_WIDTH
+			#pragma shader_feature _ _OUTLINE_FILL_INSIDE
  
  			#define USE_URP
  			#define fixed4 half4
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/package.json b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/package.json
index e11e59022..4724b1a95 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/package.json
+++ b/spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/package.json
@@ -2,7 +2,7 @@
   "name": "com.esotericsoftware.spine.urp-shaders",
   "displayName": "Spine Universal RP Shaders",
   "description": "This plugin provides universal render pipeline (URP) shaders for the spine-unity runtime.\n\nPrerequisites:\nIt requires a working installation of the spine-unity runtime, version 4.2.\n(See http://esotericsoftware.com/git/spine-runtimes/spine-unity)",
-  "version": "4.2.41",
+  "version": "4.2.42",
   "unity": "2019.3",
   "author": {
     "name": "Esoteric Software",