Subject:
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Re: Detemining Polygon Winding (Was: New Plugin for LDDesignPad)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 8 Aug 2002 01:36:47 GMT
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Viewed:
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2427 times
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Portals. It's not backface culling, it's testing all polygons for visibility
using possible rays through the openings, or from the sides of a bounding
box. This is no longer culling based on front/back but true visibility that
is computed once at load-time, and could scale to the whole model as you
build it.
I figured LDRAW was full of holes (: but I haven't yet gained a deep
familiarity with them.
By the way, how about the new version of Moller's Real Time Rendering? It's
sure to be interesting.
In lugnet.cad.dev, Don Heyse writes:
> In lugnet.cad.dev, Orion Pobursky writes:
> > In lugnet.cad.dev, Don Heyse writes:
> > > I wouldn't bother. This well known algorithm is based on an assumption
> > > that simply isn't true for the parts files. The assumption is that there
> > > is one single enclosed space inside of each part. But I think the studs
> > > are open at one end and are positioned with the open end on top of another
> > > surface. This breaks the algorithm.
> >
> > Yes but I'm not parsing primitive subfiles in my plugin, just quads and
> > triangles.
>
> OK, but if the quads and triangles don't form a single closed surface,
> or actually a bunch of closed surfaces, then the algorithm won't work.
>
> However, like I said, if you find something that works, post the code
> or the algorithm and you'll be my hero. I don't think I'll ever add
> code to parse the BFC meta-commands in ldglite. (I just don't like
> them). But I will add code that BFCs parts automatically if someone
> comes up with it.
>
> Don
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