[unity] Added `updateSeparatorPartScale` property to `SkeletonGraphic` to let render separator parts follow scale.

CHANGELOG.md

@@ -103,6 +103,7 @@
   * Timeline extension package: An additional Spine preferences parameter `Timeline` - `Default Mix Duration` has been added, setting newly added `SpineAnimationStateClip` clips accordingly, defaults to false. This Spine preferences parameter can be enabled to default to the previous behaviour before this update.
   * Tint Black: Added support for [Tint Black](http://en.esotericsoftware.com/spine-slots#Tint-black) functionality at all Spine URP shaders (2D and 3D shaders) and at all standard pipeline `Spine/Sprite` shaders. This feature can be enabled via the `Tint Black` material parameter in the Inspector. Note: The URP Sprite shaders provided in the Spine URP Shaders extension UPM package require the latest version of the spine-unity runtime (package version 4.1.12, 2023-05-31 or newer) to display the added material parameters in the Inspector GUI.
   * Added `SkeletonGraphic.MeshScale` property to allow access to calculated mesh scale. `MeshScale` is based on (1) Canvas pixels per unit, and (2) `RectTransform` bounds when using `Layout Scale Mode` other than `None` at `SkeletonGraphic` which scales the skeleton mesh to fit the parent `RectTransform` bounds accordingly.
+  * Added `updateSeparatorPartScale` property to `SkeletonGraphic` to let render separator parts follow the scale (lossy scale) of the `SkeletonGraphic` GameObject. Defaults to `false` to maintain existing behaviour.
 
 * **Breaking changes**
   * Made `SkeletonGraphic.unscaledTime` parameter protected, use the new property `UnscaledTime` instead.

spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs

@@ -64,7 +64,8 @@ namespace Spine.Unity.Editor {
 			updateTiming, updateWhenInvisible, unscaledTime, tintBlack, layoutScaleMode, editReferenceRect;
 		SerializedProperty initialFlipX, initialFlipY;
 		SerializedProperty meshGeneratorSettings;
-		SerializedProperty allowMultipleCanvasRenderers, separatorSlotNames, enableSeparatorSlots, updateSeparatorPartLocation;
+		SerializedProperty allowMultipleCanvasRenderers, separatorSlotNames, enableSeparatorSlots,
+			updateSeparatorPartLocation, updateSeparatorPartScale;
 		SerializedProperty raycastTarget, maskable;
 
 		readonly GUIContent UnscaledTimeLabel = new GUIContent("Unscaled Time",
@@ -141,6 +142,7 @@ namespace Spine.Unity.Editor {
 
 			allowMultipleCanvasRenderers = so.FindProperty("allowMultipleCanvasRenderers");
 			updateSeparatorPartLocation = so.FindProperty("updateSeparatorPartLocation");
+			updateSeparatorPartScale = so.FindProperty("updateSeparatorPartScale");
 			enableSeparatorSlots = so.FindProperty("enableSeparatorSlots");
 
 			separatorSlotNames = so.FindProperty("separatorSlotNames");
@@ -304,7 +306,7 @@ namespace Spine.Unity.Editor {
 					}
 
 					EditorGUILayout.Space();
-					SeparatorsField(separatorSlotNames, enableSeparatorSlots, updateSeparatorPartLocation);
+					SeparatorsField(separatorSlotNames, enableSeparatorSlots, updateSeparatorPartLocation, updateSeparatorPartScale);
 				}
 			}
 
@@ -428,7 +430,7 @@ namespace Spine.Unity.Editor {
 		}
 
 		public static void SeparatorsField (SerializedProperty separatorSlotNames, SerializedProperty enableSeparatorSlots,
-			SerializedProperty updateSeparatorPartLocation) {
+			SerializedProperty updateSeparatorPartLocation, SerializedProperty updateSeparatorPartScale) {
 
 			bool multi = separatorSlotNames.serializedObject.isEditingMultipleObjects;
 			bool hasTerminalSlot = false;
@@ -466,6 +468,7 @@ namespace Spine.Unity.Editor {
 
 				EditorGUILayout.PropertyField(enableSeparatorSlots, SpineInspectorUtility.TempContent("Enable Separation", tooltip: "Whether to enable separation at the above separator slots."));
 				EditorGUILayout.PropertyField(updateSeparatorPartLocation, SpineInspectorUtility.TempContent("Update Part Location", tooltip: "Update separator part GameObject location to match the position of the SkeletonGraphic. This can be helpful when re-parenting parts to a different GameObject."));
+				EditorGUILayout.PropertyField(updateSeparatorPartScale, SpineInspectorUtility.TempContent("Update Part Scale", tooltip: "Update separator part GameObject scale to match the scale (lossyScale) of the SkeletonGraphic. This can be helpful when re-parenting parts to a different GameObject."));
 			}
 		}
 

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs

@@ -116,6 +116,7 @@ namespace Spine.Unity {
 		[SerializeField] protected List<Transform> separatorParts = new List<Transform>();
 		public List<Transform> SeparatorParts { get { return separatorParts; } }
 		public bool updateSeparatorPartLocation = true;
+		public bool updateSeparatorPartScale = false;
 
 		private bool wasUpdatedAfterInit = true;
 		private bool requiresInstructionUpate = true;
@@ -952,6 +953,17 @@ namespace Spine.Unity {
 					separatorParts[p].rotation = this.transform.rotation;
 				}
 			}
+			if (updateSeparatorPartScale) {
+				Vector3 targetScale = this.transform.lossyScale;
+				for (int p = 0; p < this.separatorParts.Count; ++p) {
+					Transform partParent = separatorParts[p].transform.parent;
+					Vector3 parentScale = partParent == null ? Vector3.one : partParent.lossyScale;
+					separatorParts[p].localScale = new Vector3(
+						parentScale.x == 0f ? 1f : targetScale.x / parentScale.x,
+						parentScale.y == 0f ? 1f : targetScale.y / parentScale.y,
+						parentScale.z == 0f ? 1f : targetScale.z / parentScale.z);
+				}
+			}
 
 			for (int i = 0; i < submeshCount; i++) {
 				CanvasRenderer canvasRenderer = canvasRenderers[i];