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Summary: This is quite a thin wrapper – not sure we need it. The motivation is that `Transform3d` is not as matrix-centric now, it can be converted to SE(3) logarithm equally easily. It simplifies things like averaging cameras and getting axis-angle of camera rotation (previously, one would need to call `se3_log_map(cameras.get_world_to_camera_transform().get_matrix())`), now one fewer thing to call / discover. Reviewed By: bottler Differential Revision: D39928000 fbshipit-source-id: 85248d5b8af136618f1d08791af5297ea5179d19