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Modeling Data and Algorithms Mon, 06/09/2025 - 11:59

Collapse of thin rhombic surface

Author

Dear OpenCASCADE developers:

is it possible to collapse very thin rhombic plane surface?

Thank you in advance.

Discussion

Commenter-1 Wed, 06/11/2025 - 11:58

Hello. Could you please share some more details? Share the demonstration of your case.

Best regards, Commenter-1.

Author Wed, 06/11/2025 - 12:52

Dear Dmitrii,

thank you for response.

When I tried to heal some geometry, I met very narrow geometrical quad in it. The MWE was choosed as geometry in the attached picture, but with smallest diagonal about 1e-8.

Working in the Gmsh (with the OCC geometrical kernel) I firstly tried Heal/HealShapes technique but it did not help.

Later, I tried Coherence command (which is shortcut to BooleanFragments) and I have succeed to erase both thin surface 5 and all its extra curves and points, being kept correct full object topology.

So, the problem is solved and the answer is yes - OCC can collapse thin rhomb-like surfaces. The warning was : Fragments - BOPAlgo_AlertAcquiredSelfIntersection BOPAlgo_AlertAcquiredSelfIntersection BOPAlgo_AlertFaceBuilderUnusedEdges.

Thank you again for response.