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Will Schroeder authored
This commit acclerates geometry extraction of vtkGeometryFilter by 1) tuning data access; 2) adding a new, higher-performing method to vtkUnstructuredGrid::IsCellBoundary(); and 3) threading the algorithm. At this point typical performance improvements are 5-10x over vtkDataSetSurfaceFilter (which is harder to thread because the global face hash table is a parallel bottleneck, and requires additional support for compositing the hash table.)
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