paste surface

[teflon]

I used the function paste to combine three surfaces in one. It could represent a highway. I noticed that when surfaces cross or pass close to each other some extra triangles show up trying to stitch together the surfaces. I can not find an option that can stop this, eg "not create extra triangles". Can anyone tell me why these extra triangles occur? Can you limit it?

[Umit.Arslan]

yeah nice point. this should be fixed

[peterfunkautodesk]

If you paste the surfaces together, then the "extra" triangles are needed to complete the TIN.

That said, if what you are trying to do is display a composite of the highway surface and OG, then try using the highway surface as a "Hide" boundary to the OG surface. This will make a hole in the OG that the highway will fit into and it won't introduce any additional triangles. The boundary will be dynamic so if highway changes the final drawing will update as well.

Regards,

Peter Funk

Autodesk, Inc.

[troma]

You can use a surface as a boundary object?   That's cool to know!

But I don't think that solves the problem, and I don't think these triangles are "needed" either.  The area should be dead space.  It is outside of both original surfaces, and should remain outside of the composite.  The composite should only build where the two (or three etc.) original surfaces exist and where they cross.  Instead of this it builds across the gap where they are close to each other—this is the "extra" and unnecessary and annoying TIN that (AFAIK) there is no dynamic way to remove.

[doni49]

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@troma wrote:

But I don't think that solves the problem, and I don't think these triangles are "needed" either.  The area should be dead space.  It is outside of both original surfaces, and should remain outside of the composite.  The composite should only build where the two (or three etc.) original surfaces exist and where they cross.  Instead of this it builds across the gap where they are close to each other—this is the "extra" and unnecessary and annoying TIN that (AFAIK) there is no dynamic way to remove.

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I once had two surfaces that both contained Outer boundaries.  I pasted them together and it resulted in triangles that were outside of both boundaries.  Now if the boundaries weren't there, I could kind of understand it happening.  But when I've explicitly told it "here are your boundaries", I'd expect the surface created by pasting them in to not go beyond.  I would also understand how it could get confused where those boundaries cross.  But surely something could be done there.

The point is that I had two surfaces that are dynamically created/updated.  They're being pasted together to create a new surface.  Why do I then need to MANUALLY add a new boundary.