Can anybody tell me how to break a SubD so that I can demonstrate the repairSubD command? I don’t understand how to create non-manifold edges. Thanks
nonmanifold_subd_00.3dm (2.9 MB)
here is a simple non-manifold edge in the middle…
_repairSubD
will suggest to delete it ;-( or keep the non-manifold edge
…just draw 3 _3dFace (SubD) and join them with smooth option…
it is not very spectacular.
what do you expect ?
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Thanks for this. It did help me better understand what a non-manifold edge is, but it’s not easy to produce this. It feels like you would have to try to make one. Can you think of any common scenarios where one might produce or run into this problem?
non-manifold edges are errors in 99% of the workflows.
the tools/commands try not to produce them.
Some FEM - Analysis depend on them. - you might want to search this forum for the command _NonmanifoldMerge
…as long as you build for production, you always want manifold subds / polysurfaces / meshes, so its clear to have inside and outside or front and back.
if you have any reason to dig deeper into this special case - beside academic / intellectual interest - tell us please.
I did search around for nonmanifoldmerge, but that only confused me further. trying to reproduce the 3 surfaces sharing an edge, like what you showed me, it turns them from subD planes into polysurfaces. Maybe I should be more clear about what I’m trying to do…I’m making some short training videos for SubD commands and one of them is RepairSubD. I need some sort of example, to say here is where the RepairSubD command would be useful, but the issue is I can’t come up with a scenario. I’m sure I’ve come across one in the past, but right now it feels to me like a solution without a problem. Can you help me think of a scenarios where repairsubd would be useful?