Hans Goudey
e9f82d3dc7
These mutable pointers present problems with ownership in relation to proper copy-on-write for attributes. The simplest solution is to just remove them and retrieve the layers from `CustomData` when they are needed. This also removes the complexity and redundancy of having to update the pointers as the curves change. A similar change will apply to meshes and point clouds. One downside of this change is that it makes random access with RNA slower. However, it's simple to just use the RNA attribute API instead, which is unaffected. In this patch I updated Cycles to do that. With the future attribute CoW changes, this generic approach makes sense because Cycles can just request ownership of the existing arrays. Differential Revision: https://developer.blender.org/D15486
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