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There was a C++ STL importer since Blender 3.3, but no corresponding C++ STL exporter. This PR is adding said exporter: taking https://projects.blender.org/blender/blender/pulls/105598 and finishing it (agreed with original author). Exporting Suzanne with 6 level subdivision (4 million triangles), on Apple M1 Max: - Binary: python exporter 7.8 sec -> C++ exporter 0.9 sec. - Ascii: python exporter 13.1 sec -> C++ exporter 4.5 sec. Co-authored-by: Iyad Ahmed <iyadahmed430@gmail.com> Pull Request: https://projects.blender.org/blender/blender/pulls/114862