Design Atlas
Type
tool
Verdict
Useful
Licence
Conditional licence, mixedmixedfree; no terms page. The site is "open core": the interface is closed, while the engine underneath, glTF Transform, is MIT and usable from npm or its CLI
Agent channels
cli
Pricing
free
Reviewed

← Atlas · Topics: 3d-and-shaders, assets

gltf.report ​

Type
tool
Verdict
Useful
Licence
Conditional licence, mixedmixedfree; no terms page. The site is "open core": the interface is closed, while the engine underneath, glTF Transform, is MIT and usable from npm or its CLI
Agent channels
cli
Pricing
free
Reviewed

What it is ​

glTF Report is a single-page web app by Don McCurdy, who also wrote the glTF Transform SDK it runs on. You drop in a .glb or a .gltf with its files. It renders the model in a three.js viewport, lists its scenes, meshes, materials, textures and animations with sizes, runs the Khronos validation rules, and lets you rewrite the file with a script before exporting it again. Its feedback repository says the app is built with Svelte, Monaco, Tweakpane and glTF Transform, and that files are not uploaded: models stay on your machine, although anonymised usage analytics may be collected.

When to open it ​

Open it before any glTF model goes onto a web page: to find out why a GLB is 40 MB, which textures take the most GPU memory, whether the file breaks the spec, or to try Draco or Meshopt compression and see the new size without installing anything. It is also where the glTF Transform docs send you to try their scripting API.

Most useful ​

  • Metadata panel: per-property tables for scenes, meshes, materials, textures and animations, with counts and sizes so the heavy parts stand out
  • Textures panel: each image with its resolution, format and estimated GPU memory, with a download button
  • Validation: errors, warnings, infos and hints from the glTF validator, with a status colour on the tab
  • Script tab: a Monaco editor with typings for glTF Transform, so you can run dedup, weld, prune, simplify, resample, quantize or textureCompress on the loaded document and watch the result, with undo and redo
  • Export: GLB or JSON glTF, interleaved or separate buffers, and Draco (edgebreaker or sequential) or Meshopt (medium or high) compression

Using it with agents ​

The site has no API, llms.txt or MCP server, and scripts are typed by hand in the browser. For agent work, use the engine it runs on: have the agent install @gltf-transform/cli (MIT, 4.5.0 at review) and run the same steps from the terminal, such as gltf-transform optimize in.glb out.glb --compress draco --texture-compress webp. Then open the result in gltf.report yourself to check it visually and read the validation report. The script tab is a quick way to prototype a pipeline before handing it to the agent.

Watch out for ​

  • Some extensions can be opened and exported but are not drawn in the viewport, because three.js's loader does not support them
  • The public feedback repo was archived in favour of a Canny board, and the app's interface code is not published, so you cannot fork or self-host it
  • Compression changes precision. Check Draco or quantised output against the original, especially for skinned or morph-target models
  • Draco- or Meshopt-compressed files need the matching decoder in your runtime (three.js, Drei useGLTF), which adds a download of its own

Reusable ideas ​

  • Pair a viewer with a validator and a size breakdown, so "why is this slow?" gets answered in one screen
  • Expose the same SDK in a browser console with full typings, so the web tool doubles as a playground for the CLI
  • Say plainly whether user files leave the device, in the FAQ where people look first
  • Keep the engine open source and useful by itself, even when the polished interface is not

Three.js, Drei, Blender, Spline, Poly Haven