Arseny Kapoulkine

FWIW here's gltfpack-processed files that can be opened in https://timvanscherpenzeel.github.io/three-gltf-viewer/ (I packed them with `-c` to reduce .glb size for download so a viewer that supports `MESHOPT_compression` is required; rendering...

> It's a fair bit of complexity for the community to adopt dynamic aggregate / instance just to view an AEC model. I feel like we could attack this problem...

> re/draco: if same mesh-merge was applied, and then Draco-compressed, I'm wondering what the glb file-size, TTFP (time.firstpixel), wasm library file-size would be, compared to MESHOPT_compression ? It's a bit...

Took some time and hacked gltfpack to produce a simple merged scene with no quantization, and then used gltf-pipeline with default settings to convert this with Draco. [autodesk.zip](https://github.com/KhronosGroup/glTF/files/3961589/autodesk.zip) The results...

gltfpack supports colors but doesn't support custom attributes right now. It would need to be changed to recognize this specific attribute since it needs to know the type, but that's...

I can merge this if people find it useful.

Note: this would need to be rebased against https://github.com/zeux/volk/pull/225 (assuming anybody needs this) before merge, as that PR splits the extern "C" block into two.

For the latter I think you’d need something like #154? Together with VOLK_NO_PROTOTYPES.

This needs to be structured like KHR_texture_basisu; the current implementation for example doesn’t support specifying both png and webp images. Also missing cgltf_write support.

And one more thing :sweat_smile: I think this is missing writing the appropriate extension name in `cgltf_write_extensions`, so a written file with webp extension will be considered invalid by glTF...