Describe the bug
When importing a GLB file that has vertex colors, ambient lighting does not affect the model at all and directional light seems to apply only half as strong as for materials that use diffuse color or texture.
Steps to reproduce the behavior:
- Go to https://threejs.org/editor/
- Import the attached file
- Add an ambient light via Add/AmbientLight
- Note that the top part stays black
- Add a directional light via Add/DirectionalLight
Ambient light affects material and directional light affects material same as other materials.
[X] Device: [Desktop, Mobile]
[X] OS: [Windows, MacOS, Linux, Android, iOS]
[X] Browser: [Chrome, Firefox, Safari, Edge]
[X] Three.js version: [r126]