717c970297
The function `direction_to_<some projection model>` computes the inverse of `<some projection model>_to_direction`. Some of these functions had a bug where they mirror the x-axis, and some of them could be simplified. I added round-trip tests for all of them. This MR might change the behavior of the renderer when using equiangular_cubemap_face_to_direction: I normalized the result vector. I looked at the usages and I think it's normalized later anyways, but someone else should probably verify that this doesn't cause issues. Pull Request: https://projects.blender.org/blender/blender/pulls/123932
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