fix: restore 3d pbr textures in canvas viewer

components/canvas/CanvasChatPanel.tsx

@@ -72,6 +72,7 @@ import {
 import {
   getGenerationCreditCostFromImageGenConfig,
   getImageCreditCostFromConfig,
+  getImageModelCreditDiscountLabel,
 } from "@/lib/ai/image-model-pricing";
 import { getVideoToolOptionsForMode } from "@/lib/ai/video-tool-capability";
 import type { Attachment, ChatMessage } from "@/lib/types";
@@ -9321,7 +9322,12 @@ export function CanvasChatPanel({
       )}
     >
       <div className="max-h-[312px] space-y-0.5 overflow-y-auto pr-1">
-        {selectableModels.map((model) => (
+        {selectableModels.map((model) => {
+          const discountLabel = getImageModelCreditDiscountLabel(
+            model.imageGenConfig
+          );
+
+          return (
           <SelectItem
             key={model.id}
             value={model.id}
@@ -9368,19 +9374,34 @@ export function CanvasChatPanel({
                 </span>
                 <span className="truncate text-[12px] font-medium leading-none">{model.displayName}</span>
               </span>
-              {modelSelectValue === model.id ? (
-                <span
-                  className={cn(
-                    "text-sm font-semibold",
-                    isVideoWorkspace ? "text-foreground" : "text-[#1f2937]"
-                  )}
-                >
-                  ✓
-                </span>
-              ) : null}
+              <span className="flex shrink-0 items-center gap-1.5">
+                {discountLabel ? (
+                  <span
+                    className={cn(
+                      "rounded-md border px-1.5 py-0.5 text-[10px] font-semibold leading-none",
+                      isVideoWorkspace
+                        ? "border-border/70 bg-muted/80 text-foreground/80"
+                        : "border-[#d0d4dc] bg-[#eef1f5] text-[#5c6574] dark:border-white/15 dark:bg-white/10 dark:text-zinc-200"
+                    )}
+                  >
+                    {discountLabel}
+                  </span>
+                ) : null}
+                {modelSelectValue === model.id ? (
+                  <span
+                    className={cn(
+                      "text-sm font-semibold",
+                      isVideoWorkspace ? "text-foreground" : "text-[#1f2937]"
+                    )}
+                  >
+                    ✓
+                  </span>
+                ) : null}
+              </span>
             </span>
           </SelectItem>
-        ))}
+          );
+        })}
         {selectableModels.length === 0 ? (
           <div
             className={cn(

components/canvas/model3d/Model3DViewer.tsx

@@ -13,6 +13,7 @@ import { AlertCircle, Box, ExternalLink, Loader2 } from "lucide-react";
 import React, { Suspense, useEffect, useMemo, useRef } from "react";
 import * as THREE from "three";
 import type { Mesh, Object3D } from "three";
+import { KTX2Loader } from "three-stdlib";
 import { Button } from "@/components/ui/button";
 import { buildThreeAssetUrl } from "@/lib/canvas/three-asset-url";
 
@@ -72,6 +73,8 @@ const CAMERA_PRESET_POSITIONS: Record<
   top: [0, 3.4, 0.001],
 };
 
+const KTX2_TRANSCODER_PATH = "/three/basis/";
+
 function CameraPresetController({
   controlsRef,
   preset,
@@ -201,7 +204,28 @@ function ModelScene({
   onLayersChange?: (layers: Model3DLayer[]) => void;
   onStatsChange?: (stats: Model3DStats) => void;
 }) {
-  const model = useGLTF(url);
+  const { gl } = useThree();
+  const ktx2Loader = useMemo(() => {
+    const nextLoader = new KTX2Loader();
+    nextLoader.setTranscoderPath(KTX2_TRANSCODER_PATH);
+    nextLoader.detectSupport(gl);
+    return nextLoader;
+  }, [gl]);
+
+  useEffect(() => {
+    return () => {
+      ktx2Loader.dispose();
+    };
+  }, [ktx2Loader]);
+
+  const model = useGLTF(
+    url,
+    true,
+    true,
+    (loader) => {
+      loader.setKTX2Loader(ktx2Loader);
+    },
+  );
   const scene = useMemo(() => model.scene.clone(), [model.scene]);
   const meta = useMemo(() => collectSceneMeta(scene), [scene]);
 
@@ -219,15 +243,25 @@ function ModelScene({
 
   useEffect(() => {
     for (const { mesh } of meta.meshRefs) {
+      mesh.castShadow = true;
+      mesh.receiveShadow = true;
       const materials = Array.isArray(mesh.material)
         ? mesh.material
         : [mesh.material];
       for (const material of materials) {
         if (!material) continue;
+        const textureLikeKeys = ["map", "emissiveMap"] as const;
+        for (const key of textureLikeKeys) {
+          const texture = (material as any)?.[key];
+          if (texture && "colorSpace" in texture) {
+            texture.colorSpace = THREE.SRGBColorSpace;
+            texture.needsUpdate = true;
+          }
+        }
         if ("wireframe" in material) {
           (material as any).wireframe = settings.wireframe;
-          material.needsUpdate = true;
         }
+        material.needsUpdate = true;
       }
     }
   }, [meta.meshRefs, settings.wireframe]);
@@ -381,6 +415,11 @@ export function Model3DViewer({
         }}
         className="bg-gradient-to-b from-zinc-900 to-zinc-950"
         gl={{ preserveDrawingBuffer: true }}
+        onCreated={({ gl }) => {
+          gl.outputColorSpace = THREE.SRGBColorSpace;
+          gl.toneMapping = THREE.ACESFilmicToneMapping;
+          gl.toneMappingExposure = 1;
+        }}
       >
         <ViewerCaptureBridge onCaptureReady={onCaptureReady} />
         <CameraPresetController