Point size is not supported in WebGPU, so you should not set gl_PointSize: points are always 1 pixel sized.
Also, position and color attributes are automatically injected so you should not pass them through the attributes parameter of the ShaderMaterial constructor.
Lastly, the z coordinate in NDC space is in the 0…1 range in WebGPU, not -1…1. So you must update the vertex coordinates you pass to the shader.
Here’s an updated PG that works both in WebGPU and WebGL:
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