Cesium can't load COMPRESSED gltf

CesiumJS
1

Hi,

I’m using offline Collada to glTF converter. It works for non-compression gltf. But when I enable the compression (with option “-c Open3DGC”), Cesium failed to load the gltf model. Showing error :

“TypeError: Failed to execute ‘vertexAttrib3fv’ on ‘WebGLRenderingContext’: No function was found that matched the signature provided.”

The compression looks really good as it’s reduced about 50% of the size. Wondering how can it be used in Cesium?

btw, in the non-compression gltf, looks like the color information in COLLADA is missing, which result a simple white model with no color. This model doesn’t have any texture but just (vertex?) color.

Best,

Narco

2

Hi Narco,

Cesium doesn’t support glTF compression yet. The spec for glTF compression is not ready yet and will change. Watch #230.

As for losing color information from the COLLADA file, can you share the model so we can test?

Patrick

3

Hi Patrick,

Thanks for the info.

For the color issue, sorry I can’t share it as it’s a proprietary model of our partner. It can be correctly viewed in Xcode. I noticed, the color info in the Collada file is in this tag:

After the conversion to glTF, the model appears no color at all.