chore: sync workspace state

MVS/3DGS-Unity/Editor/GaussianTool.cs

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MIT
+
+using GaussianSplatting.Runtime;
+using UnityEditor.EditorTools;
+using UnityEngine;
+
+namespace GaussianSplatting.Editor
+{
+    abstract class GaussianTool : EditorTool
+    {
+        protected GaussianSplatRenderer GetRenderer()
+        {
+            var gs = target as GaussianSplatRenderer;
+            if (!gs || !gs.HasValidAsset || !gs.HasValidRenderSetup)
+                return null;
+            return gs;
+        }
+
+        protected bool CanBeEdited()
+        {
+            var gs = GetRenderer();
+            if (!gs)
+                return false;
+            return gs.asset.chunkData == null; // need to be lossless / non-chunked for editing
+        }
+
+        protected bool HasSelection()
+        {
+            var gs = GetRenderer();
+            if (!gs)
+                return false;
+            return gs.editSelectedSplats > 0;
+        }
+
+        protected Vector3 GetSelectionCenterLocal()
+        {
+            var gs = GetRenderer();
+            if (!gs || gs.editSelectedSplats == 0)
+                return Vector3.zero;
+            return gs.editSelectedBounds.center;
+        }
+    }
+}