Subject:
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Re: Smooth surfaces
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Newsgroups:
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lugnet.cad.ray
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Date:
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Mon, 11 Nov 2002 18:48:50 GMT
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Viewed:
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1179 times
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In lugnet.cad.ray, Kevin Clague writes:
> I know this is an old discussion, but I really like Steve's idea of
> meta-statements to control this.
>
> What would be really cool is to have all the primitives and parts in the parts
> library have the meta-statements that simply turn smooth triangles on and off.
> This way we would not need a heuristic.
>
> It is probably a *huge* effort, but we could run each part in the library (and
> primitives) through a heuristic and then review each part to see if we want to
> override the heuristics. This is probably really nieve, due to the amount of
> work, but it is the optimal solution.
Actually the meta-statements are probably unnecessary because all the
information already exists in the parts in the form of type 2 and type
5 lines. Type 2 lines indicate a hard edge and type 5 lines (or the
absence of type 2 lines) indicate a smooth join. An algorithm based
on this observation was recently published one of the cad newsgroups,
and is in fact already implemented in ldview. Since the source code
to ldview is available, it should be fairly easy to make use of this
without resorting to inaccurate heuristics or extra meta-statements.
Have fun,
Don
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Message is in Reply To:
 | | Re: Smooth surfaces
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| I know this is an old discussion, but I really like Steve's idea of meta-statements to control this. What would be really cool is to have all the primitives and parts in the parts library have the meta-statements that simply turn smooth triangles on (...) (22 years ago, 11-Nov-02, to lugnet.cad.ray)
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