VRMLLoader: Support normals, creaseAngle, and index

When importing this vrml file: test.wrl.zip, I expect to get this:

But instead I get this:

When inspecting the VRML file, I can see that there is an attribute called creaseAngle, which I suspect is the normal definition angle.

However, in the source code for the VRMLLoader, I can find no such attribute check.

[Glinkis]

Me and my colleague have been trying to implement crease angle support for a while now, and we’ve almost got it working.

However it’s not what I’d call the most elegant solution, and putting this logic in VRMLLoader seems kind of pointless.

Iit would be way better to just have a computeVertexNormals( creaseAngle ) method in BufferGeometry, like #14859.

The loader could then just call this method and be done with it. it would also enable other loaders to do angle creasing, without a bunch of repeated logic.

[mrdoob]

What about having the same geometry on multiple meshes, when the vrml defines an instance?

Yes, that works and it’s definitely encouraged 👌