normalized BufferAttribute and BufferGeometryUtils.mergeVertices get wrong result

[danborutori]

Using BufferGeometryUtils.mergeVertices on geometry with normalized attribute cause values in result buffer normalized twice.

line 604: newarray.push( attribute getterFunc );
Using normalized values returned from getterFunc to construct newarray.

line: 637: const attribute = new THREE.BufferAttribute( buffer, oldAttribute.itemSize, oldAttribute.normalized );
Values are not denormalized when constructing a new BufferAttribute.

Platform:

• Device: [Desktop, Mobile]
• OS: [Windows, MacOS, Linux, Android, iOS]
• Browser: [Chrome, Firefox, Safari, Edge]
• Three.js version: [r144]

[donmccurdy]

Thanks @danborutori! I'll look into this.

Though aside, I think it's a good use case for @gkjohnson's proposal in #24515.

[donmccurdy]

• /cc BufferGeometryUtils: Fix mergeVertices() with normalized vertex attributes #24577