Jeremy Reizenstein

This shows pytorch3d 0.7.5 from pypi, on linux, and we don't have such a thing. How did you install?

> I downloaded the package from [anaconda.org/pytorch3d/pytorch3d/files](https://anaconda.org/pytorch3d/pytorch3d/files), and installed it offline. If so, I don't think it worked. It should be fine to download a conda package from there and...

@zb12138 Maybe a `conda install` or `pip install` command did something radical e.g. removing something? Normally you get a prompt asking whether you want that to happen and the answer...

I think your best option in pytorch3d would be to try [MeshRasterizerOpenGL](https://github.com/facebookresearch/pytorch3d/blob/main/pytorch3d/renderer/opengl/rasterizer_opengl.py#L123) which should be much faster.

I'm sorry I haven't, and I don't know enough to help. Can you run the pytorch3d unit tests and see if the opengl ones work?

I'm not so worried about test_no_egl_error. Can you try tests.test_rasterizer please?

You can take a piece of a mesh with submeshes - https://github.com/facebookresearch/pytorch3d/blob/main/pytorch3d/structures/meshes.py#L1550 . I wonder if the problem isn't the size but the layout of the vertices? The error is...

I think you're right - and that comment has always been the wrong way round. Do you want to send a PR to fix it?

The function needs to work with items of different lengths (Mi different for each i). I think you need to sum over the lengths, and then this should work.

@Ruishenl Thank you!