Hans Goudey
59343ee162
Currently, when normals are calculated for a const mesh, a custom data layer might be added if it doesn't already exist. Adding a custom data layer to a mesh is not thread-safe, so this can be a problem in some situations. This commit moves derived mesh normals for polygons and vertices out of `CustomData` to `Mesh_Runtime`. Most of the hard work for this was already done by rBcfa53e0fbeed7178. Some changes to logic elsewhere are necessary/helpful: - No need to call both `BKE_mesh_runtime_clear_cache` and `BKE_mesh_normals_tag_dirty`, since the former also does the latter. - Cleanup/simplify mesh conversion and copying since normals are handled with other runtime data. Storing these normals like other runtime data clarifies their status as derived data, meaning custom data moves more towards storing original/editable data. This means normals won't automatically benefit from the planned copy-on-write refactor (T95845), so it will have to be added manually like for the other runtime data. Differential Revision: https://developer.blender.org/D14154
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