History of surface edge

[boffin5]

Hi folks,

I have tne edge of a surface, which used to meet up with the edges of several other surfaces. I erased those, but now when I use the extract function to get a boundary curve from the original long surface, it gives me short curves where the smaller surfaces used to be. But I want one long boundary curve.

Does this make sense? How do I get the system to forget about the old shorter surfaces, so I can get a long boundary curve?

 

[solid7]

There are a multitude of options, depending on what your surface looks like, and what other geometry is available.

Can you post a specific image of your surface, and the adjacent surfaces?




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[boffin5]

Now I can answer my own question (not for the first time). When you use the extract function, there is an optional selection for propogate. This results in the entire edge of the surface being used for the boundary curve. However, it shows up as a join, if several other surfaces were previously on the other side of the interface. My related post, about how to simplify a multisegment curve, received informative replies about how to do that.

 

[solid7]

It would be good at this point to extrapolate the surface (by curvature with tangent propagation) and trim it back to the newly federated curve. This will make the edge a solid curve in the future when you do extracts or intersects.




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