Modifying surface normals
Altair EmployeeCan anyone explain which surfaces have their normals changed in Hypermesh V12? The help file says that:
This functionality automatically adjusts the minimum set of surfaces required to maintain overall consistency of the surface normals, without affecting other surfaces, based on the input surface selection. The minimum set of surfaces is found from all surfaces attached by shared edges. This includes the entire surface shell, not just the adjacent surfaces. This prevents problems that can arise from incorrect or inconsistent orientations.
I have part of my model which is a closed box. Most of the surface normals point outwards, but those on one side point inwards. When I select the inward pointing surfaces, individually or by window, and ask for their normals to be reversed then those surfaces are reversed but so are all the other surfaces, so the originally inward surfaces are still inconsistent with the rest. Is it possible to limit the reversing to only the surfaces I select?
Answers
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Hello,
since Version 10 or 11 it is not possible to orient single surfaces. If there are connected surfaces, then all of the connected surfaces are investigated.
Normally for a closed cube it works perfect. Only if you have 'non-manifold' edges (yellow) then there is a chance for opposed oriented surfaces.
You can try to disconnect the surface (red edges), reverse them and then reconnect them.
Regards,
Mario
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Mario, thank you for your reply: your suggestion of disconnecting the surfaces, reversing them and reconnecting them did work. I'm not very happy with the program reversing the surfaces it thinks fit without giving me the option to at least confirm the changes first, but it appears that someone in their wisdom thought otherwise.
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