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STEP export: Fix schema, required attributes and bound orientation - #1816
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Declare AP214 for the existing colour/transparency output and use compatible product context entities. Supply empty name and description strings on solid and wireframe representation relationships. Translate native material-on-right UV loops to STEP by reversing the face-bound sense for both outer and inner bounds. Keep the spline geometry and representation structure unchanged.
phkahler
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Nov 9, 2026
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The changes look simple enough, and you tried it with existing software. Looks good to me.
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Declare AP214 for the existing colour/transparency output and use compatible product context entities. Supply empty name and description strings on solid and wireframe representation relationships.
Translate native material-on-right UV loops to STEP by reversing the face-bound sense for both outer and inner bounds. Keep the spline geometry and representation structure unchanged.
Discovered while working on STEP linking/import using STEPcode with a strict parser that does not accept deviations from the spec. Exported STEP files still open correctly with Open Cascade OCCT based software as well as Kisters 3DViewStation (the only ones I currently have available) - but they opened the old ones as well - presumably they are more tolerant to invalid STEP files.