A four-viewport 3D model inspector in a single renderer: wireframe for structure, UV for texture mapping, PBR for lighting, normal/depth for anomalies. All parsing and rendering happen locally in your browser — your model files are never uploaded to any server.

Notes:

• Loads GLB / glTF / OBJ (with MTL) / FBX / STL / USDZ — drag files onto the viewport area or click “Choose model”
• Zip archives work directly: downloads from model sites (Sketchfab / CGTrader etc.) are usually zips (main model + .bin / .mtl / textures). No manual extraction needed — the tool unpacks in memory and resolves .bin, .mtl and textures by their in-archive relative paths
• All four viewports share one scene and camera state: rotate / pan / zoom in any viewport and the other three follow strictly
• After loading, one-click export to GLB / OBJ+MTL / STL (binary, 3D-print ready) / USDZ (previewable in iOS AR Quick Look)
• Full USDZ support: ASCII usda via the built-in parser; binary usdc (the default Apple / Reality Converter format) via a built-in WASM parser (tinyusdz, 1.3 MB zstd-compressed, cached after first load, fully local)
• When the model lacks UV coordinates (STL etc.), the UV viewport shows a hint and offers one-click box-projection UV generation
• Before any model is loaded, a built-in sample (torus knot) is shown so you can try all four viewports right away
• On mobile (width < 768px) the tool switches to a single viewport with tab switching