b8d0bef3b4
- Deduplicate Fisheye projection code - Replace spherical/cartesian conversions with shared helpers - Replace transforms from/to local coordinate systems with shared helpers The main type of repeated transform that's not covered here is `to/from_coords`, but with separate values for xy and z (e.g. BSDFs that already computed `dot(wi, N)` earlier, so they only need `dot(wi, X)` and `dot(wi, Y)` later). Could also be replaced, but it would feel weirdly specific for a helper function. Pull Request: https://projects.blender.org/blender/blender/pulls/125999
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