Subject:
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Re: Vertices not coplanar?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 18 Jul 2003 00:42:01 GMT
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Viewed:
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1196 times
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In lugnet.cad.dev, Tore Eriksson wrote:
> What troubles do these warnings cause? I see no problems with the renderings, no
> matter what renderer I use.
What Orion said.
> How do I correct them? By splitting all the quads into two triangles each I
> guess? If so, why not make a tool that splits them up?
Sometimes, it just means the vertices are incorrect. If the vertices
are correct, then you should break the quads into two triangles, and put
a soft edge (linetype 5) along the common edge.
But often, it's worth looking at how the quad(s) were created, to see if
there's another way of selecting vertices that avoids the problem
entirely.
I've added code in LDAO to perform this function, but it's not ready for
release yet.
One of the problems with any automatic tool is that it's probably going
to pick the triangle pairs at random, and usually one way of splitting
the quad is better than the other. One triangle pair will make a
concave surface, the other triangle pair will make a convex surface.
Steve
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Message has 1 Reply:
 | | Re: Vertices not coplanar?
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| (...) Right, it is typically an error if the four points of a quad do not lie in a plane. Too bad that the LDraw format has a built-in possiblity of creating degenerate quads. POV e.g. uses 2D points to describe a polygon. See also "Method for (...) (21 years ago, 18-Jul-03, to lugnet.cad.dev)
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Message is in Reply To:
| | Vertices not coplanar?
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| What troubles do these warnings cause? I see no problems with the renderings, no matter what renderer I use. How do I correct them? By splitting all the quads into two triangles each I guess? If so, why not make a tool that splits them up? /Tore (21 years ago, 17-Jul-03, to lugnet.cad.dev)
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