fix(web): preserve texture references in GLTF viewer material cloning

Fixes texture loss issue where cloning textures in cloneSceneWithMaterials
was breaking glTF texture data. Now preserves original texture references
to maintain texture integrity during material cloning.

Author: rmarquis

apps/web/src/components/workflow/gltf-viewer/utils.ts

@@ -67,13 +67,17 @@ export function cloneSceneWithMaterials(source: Group): Group {
 
   const cloneMaterial = (mat: Material): Material => {
     const clonedMat = mat.clone();
-    // Clone key textures if present
     const anyMat = clonedMat as any;
-    if (anyMat.map) anyMat.map = anyMat.map.clone();
-    if (anyMat.normalMap) anyMat.normalMap = anyMat.normalMap.clone();
-    if (anyMat.roughnessMap) anyMat.roughnessMap = anyMat.roughnessMap.clone();
-    if (anyMat.metalnessMap) anyMat.metalnessMap = anyMat.metalnessMap.clone();
-    if (anyMat.emissiveMap) anyMat.emissiveMap = anyMat.emissiveMap.clone();
+    const originalMat = mat as any;
+
+    if (originalMat.map) anyMat.map = originalMat.map;
+    if (originalMat.normalMap) anyMat.normalMap = originalMat.normalMap;
+    if (originalMat.roughnessMap)
+      anyMat.roughnessMap = originalMat.roughnessMap;
+    if (originalMat.metalnessMap)
+      anyMat.metalnessMap = originalMat.metalnessMap;
+    if (originalMat.emissiveMap) anyMat.emissiveMap = originalMat.emissiveMap;
+
     anyMat.needsUpdate = true;
     return clonedMat;
   };