Mesh Augmentations/Transforms: Edge Flipping / Vertex Shifting

[MatteoGioia]

Hi, I am trying to implement Edge Flipping / Vertex Shifting on triangular meshes.

The idea is shown in this picture

In the case of meshes one would also have to consider the angle of each face to avoid incorrectly morphing the original mesh (i.e. only flip edges for flat adjacent faces).

I saw that an this PR #2293 mentions an architecture that has already implemented them (MeshCNN), but the code provided is incomplete/not merged.

Any pointers on where I could start to implement them?

[rusty1s]

I am sorry for the super late reply. In general, I have no objection to integrate better mesh support into PyG. Would it be sufficient to integrate these as transformations, similar to other ones such as GenerateMeshNormals, FaceToEdge, etc?

[MatteoGioia]

Hi @rusty1s and thanks for taking the time to answer :)

Yes it would be great, the main issue with the code in the PR mentioned above is that the augmentation code is really specific for MeshCNN. I tried to readapt some of the augmentations (and they work) but it would be nice to have them as transforms in a DataLoader for ease of use.

[rusty1s]

Yes, I think that's one of the reasons that PR isn't merged yet. Please feel free to bring these augmentations to PyG in a more general and PyG-way :)