when only vertices are exported as glb, Vertex color is incorrect

[chen649285912]

What I want to do？
I want to export a point cloud model with color in blender, and render it in babylon.js. Like this photo

Steps to reproduce the behavior:

1. I generated a mesh point with vertex color data through geometry node in blender
   

2. Then convert it to a vertex-only mesh, and you can query the vertex to see the color attribute
   

3.Export glb, use recommended vertex export options (cannot export correctly using various options)

4. I put it into the babylon sandbox and found that the vertex color is incorrect
   

I want to know what this problem is, please check it out, thank you very much！

The following are the test files（Contains glb and blend files）
test.zip

Version
-windows 11

• Blender 4.2
  -addon version 4.3.12

I personally speculate that this is because i can only export and import vertex colors based on face corner-byte color in blender.
If so, I hope that the function of exporting vertex-color can be added to meet the demand of exporting point clouds separately.
Thanks again!

[julienduroure]

Confirmed.
The exported gltf file is not valid.
I have a fix in progress, but seems I also discovered that it will need more work on alpha VC .

[chen649285912]

Thanks, I'll be looking forward to this fix