Geometry Cleanup in Onshape

Jonathan_Hutchinson

I've been attempting some cleanup work of imported files, creating cleaner simplified solids for Shelling. A couple of binds that I've found myself coming up against which would be incredibly simple in a surface modeller are of course the ability to untrim, but also for cleaner downstream ops in Onshape the ability to merge or cleanup very small poky edges on surfaces that are maybe poorly interpreted trimming curves.

Additional to that, some of the go-tos that rescue me from being cornered include Move Boundary and Fill. The latter disturbs me sometimes, though. Patching a little 3 sided hole with positional continuity then blends seamlessly into the surface as though the hole were untrimmed. Is this the reality under the hood of what's happening?

Any tips/custom feature recommendations would be appreciated. In the case of an edge merger, this would seem really good for refitting trim boundaries to an acceptable tolerance so that geometry is cleaned up.

S1mon

Fill or Move boundary internally can indeed basically untrim an internal hole. See some of the comments in this thread: https://forum.onshape.com/discussion/comment/94606/#Comment_94606

@GregBrown Wrote an "Extract" custom feature which will give you the original untrimmed surface. It can be super useful for clean up like this.
https://cad.onshape.com/documents/f8e393009542906a221a138d/v/0161e182089acc773545385b/e/4416c4ba1a98791153984a83

Jonathan_Hutchinson

Thank you @GregBrown as always! Having the clean untrimmed surface is a great start. That with the Split Iso should help me get some nicer geometry to start with and remove these mangled edges (which may be coincident Isocurves at source, to be honest).