Subject:
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Re: Hidden surface removal, and vertex order in part/primitive DAT files
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 27 Sep 1999 12:36:44 GMT
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Viewed:
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424 times
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John VanZwieten wrote in message ...
> If you run a LUGNET search on backface culling, you'll find extensive
> discussion of this. Some parts (mostly done by Steve Bliss) have a "0 CW-
> Compliant" tag, which means you can use backface culling on them.
>
> It would be pretty amazing if you could create a utility to automatically • fix
> other parts. Even if you fix the vertex order of polygons, you have to • worry
> about the transformations applied to primitives and subparts in a part • file.
> And then you'd have to adjust for transformations applied to parts and
> submodels in a model file.
>
> Would be great to save 1/2 the rendering time, though.
>
> -John Van
Thanks for the tip, I'll run a search.
Actually I think I've worked out in my mind an automatic clockwise-sorting
algorithm. It will fail for primitives like studs which are not closed
polyhedra, but I assume most parts are in fact closed. :) (It can detect
whether manual tweaking may be necessary).
-Gary
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