fix: harden viewer/editor renderer init and error handling (#133)

packages/viewer/src/hooks/use-gltf-ktx2.tsx

@@ -1,19 +1,39 @@
-import { useGLTF } from "@react-three/drei"
-import { useThree } from "@react-three/fiber"
-import { KTX2Loader } from "three/examples/jsm/Addons.js"
-import { MeshoptDecoder } from "three/examples/jsm/libs/meshopt_decoder.module.js"
+import { useGLTF } from '@react-three/drei'
+import { useThree } from '@react-three/fiber'
+import { KTX2Loader } from 'three/examples/jsm/Addons.js'
+import { MeshoptDecoder } from 'three/examples/jsm/libs/meshopt_decoder.module.js'
 
 const ktx2LoaderInstance = new KTX2Loader()
 ktx2LoaderInstance.setTranscoderPath('https://cdn.jsdelivr.net/gh/pmndrs/drei-assets@master/basis/')
+const ktx2ConfiguredRenderers = new WeakSet<object>()
+const ktx2WarningLoggedRenderers = new WeakSet<object>()
 
 const useGLTFKTX2 = (path: string): ReturnType<typeof useGLTF> => {
   const gl = useThree((state) => state.gl)
 
   return useGLTF(path, true, true, (loader) => {
-    ktx2LoaderInstance.detectSupport(gl)
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    loader.setKTX2Loader(ktx2LoaderInstance as any)
+    const renderer = gl as unknown as object
+
+    if (!ktx2ConfiguredRenderers.has(renderer)) {
+      try {
+        ktx2LoaderInstance.detectSupport(gl)
+        ktx2ConfiguredRenderers.add(renderer)
+      } catch (error) {
+        // Some WebGPU flows can transiently call this before backend init.
+        // Avoid crashing the whole scene; scans may render without KTX2 on this pass.
+        if (!ktx2WarningLoggedRenderers.has(renderer)) {
+          console.warn('[viewer] Skipping KTX2 support detection for now.', error)
+          ktx2WarningLoggedRenderers.add(renderer)
+        }
+      }
+    }
+
+    if (ktx2ConfiguredRenderers.has(renderer)) {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      loader.setKTX2Loader(ktx2LoaderInstance as any)
+    }
+
     loader.setMeshoptDecoder(MeshoptDecoder)
   })
 }
-export { useGLTFKTX2 }
+export { useGLTFKTX2 }