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Summary: Defines a function to run marching cubes algorithm on a single or batch of 3D scalar fields. Returns a mesh's faces and vertices. UPDATES (12/18) - Input data is now specified as a (B, D, H, W) tensor as opposed to a (B, W, H, D) tensor. This will now be compatible with the Volumes datastructure. - Add an option to return output vertices in local coordinates instead of world coordinates. Also added a small fix to remove the dype for device in Transforms3D - if passing in a torch.device instead of str it causes a pyre error. Reviewed By: jcjohnson Differential Revision: D24599019 fbshipit-source-id: 90554a200319fed8736a12371cc349e7108aacd0