BufferGeometry position attribute doesn't update when using WebGPURenderer r173

[LarryWu1]

Description

Updating BufferGeometry position attribute does nothing with WebGPURenderer. WebGLRenderer updates correctly.

Reproduction steps

1. Create WebGPURenderer
2. Pass BufferGeometry to a mesh and add it to a scene
3. In the render loop, update position attributes

Code

const geometry = new THREE.BufferGeometry()
...

function animate() {
  geometry.setAttribute('position', new THREE.BufferAttribute(new Float32Array([...]), 3))
  geometry.attributes.position.needsUpdate = true

  ...
  renderer.render(...)
}

Live example

https://codesandbox.io/p/sandbox/t6g6yn

Change to WebGLRenderer and the line moves as expected

Screenshots

No response

Version

r173

Device

Desktop

Browser

Chrome

OS

Windows

[Mugen87]

You are not supposed to overwrite an existing buffer attribute. Instead update the existing array data.

The size of the attribute is supposed to be fixed. If not, you have to call dispose() on the geometry and create a new one.