From trimmed surface to untrimmed surface

Grasshopper
15

Hi @Tom_Newsom,

If you mean this Merge surfaces (trim and untrim) sharing same edge - #10 by Tom_Newsom or Work (isotrim) with a Trimmed Surface in GH - #4 by Tom_Newsom . It works for quite “simple” surface. With this actual complex surface, the tweencurve component in the V direction isn’t outputting good results. So it makes impossible to pull curves back to the original surface.

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Also, Fitloft, loft, ruled surface, sweep are all outputting results that are not quite fitting the original surface. see here also FitLoft solution deformation

As it is a trimmed srf, the Isocurve component of cours isn’t outputing something to work with.

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The option with more potentiel appears to be to rebuild with network surface. Extract U,V crvs from orginal srf (how?) – pull it back to original srf – Extract edges – and create that netsrf. But this workflow get me errors many times.. Morelikely unrobust..

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Here, I’m mainly looking to understand how to work with trimmed surfaces. If any other simple robust workflows, or components are available.

Thanks,

CC