diff --git a/website/src/components/GalleryWorkbench/GalleryWorkbench.tsx b/website/src/components/GalleryWorkbench/GalleryWorkbench.tsx
index dc3fb10..ce42f30 100644
--- a/website/src/components/GalleryWorkbench/GalleryWorkbench.tsx
+++ b/website/src/components/GalleryWorkbench/GalleryWorkbench.tsx
@@ -753,7 +753,7 @@ export default function GalleryWorkbench() {
               showGround={sceneOptions.showGround}
               helperScale={helperScale}
               helperTarget={helperTarget}
-              mergePolygonsForMesh={!hasActiveAnimation}
+              mergePolygonsForMesh={!hasActiveAnimation && renderLoaded?.kind !== "primitive"}
               stableDomForMesh={hasActiveAnimation}
               animationKey={activeAnimation ? `${selectedAnimation}:${renderLoaded?.label ?? ""}` : undefined}
               animationDurationSeconds={activeAnimation?.duration}
diff --git a/website/src/components/GalleryWorkbench/hooks/useScenePolygons.ts b/website/src/components/GalleryWorkbench/hooks/useScenePolygons.ts
index c3a3d8e..2a39e5c 100644
--- a/website/src/components/GalleryWorkbench/hooks/useScenePolygons.ts
+++ b/website/src/components/GalleryWorkbench/hooks/useScenePolygons.ts
@@ -40,6 +40,9 @@ export function useScenePolygons({
         : loaded.rawPolygons;
     }
     if (loaded.parseResult.voxelSource) return loaded.rawPolygons;
+    if (loaded.kind === "primitive") {
+      return optimizeMeshPolygons(loaded.rawPolygons, { meshResolution: "lossless" });
+    }
     return optimizeMeshPolygons(loaded.rawPolygons, {
       meshResolution: effectiveMeshResolution,
     });