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Kristian Bendiksen
3067823e71
Replace the monolithic RigNonUniformRefinement class with a proper polymorphic hierarchy: RigRefinement (abstract base), RigNoRefinement (identity), RigUniformRefinement (O(1) uniform), and RigNonUniformRefinement (per-cell custom fractions). Ownership uses std::unique_ptr<RigRefinement>, consumers receive const RigRefinement&. This eliminates the misleading class name, removes effectiveRefinement() indirection, and gives each refinement mode an appropriately optimized implementation.