From 77e859cb31a5fdafd20d72a59cba256bf7a5619b Mon Sep 17 00:00:00 2001
From: Harald Csaszar <harald.csaszar@pixelcloudgames.com>
Date: Mon, 6 May 2024 20:46:14 +0200
Subject: [PATCH] [unity] Improved UpdateWhenInvisible logic for
 SkeletonRenderSeparator. Closes #2519.

---
 .../SkeletonRenderSeparator.cs                | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

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 627647599..77e33cd2d 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
@@ -73,6 +73,7 @@ namespace Spine.Unity {
 		[Tooltip("Copies MeshRenderer flags into each parts renderer")]
 		public bool copyMeshRendererFlags = true;
 		public List<Spine.Unity.SkeletonPartsRenderer> partsRenderers = new List<SkeletonPartsRenderer>();
+		[System.NonSerialized] public bool isVisible = true;
 
 #if UNITY_EDITOR
 		void Reset () {
@@ -197,6 +198,10 @@ namespace Spine.Unity {
 				skeletonRenderer.LateUpdateMesh();
 		}
 
+		public void Update () {
+			UpdateVisibility();
+		}
+
 		public void OnDisable () {
 			if (skeletonRenderer == null) return;
 #if SPINE_OPTIONAL_RENDEROVERRIDE
@@ -206,6 +211,24 @@ namespace Spine.Unity {
 			ClearPartsRendererMeshes();
 		}
 
+		public void UpdateVisibility () {
+			foreach (SkeletonPartsRenderer partsRenderer in partsRenderers) {
+				if (partsRenderer == null) continue;
+
+				if (partsRenderer.MeshRenderer.isVisible) {
+					if (!isVisible) {
+						skeletonRenderer.OnBecameVisible();
+						isVisible = true;
+					}
+					return;
+				}
+			}
+			if (isVisible) {
+				isVisible = false;
+				skeletonRenderer.OnBecameInvisible();
+			}
+		}
+
 		MaterialPropertyBlock copiedBlock;
 
 		void HandleRender (SkeletonRendererInstruction instruction) {