Subject:
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Re: Performance Improvement
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 19 Apr 2000 00:30:38 GMT
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Viewed:
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874 times
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Damien Duquennoy wrote...
> Well, i think it's also possible to substitue some quads to the triangles. But i've made some tests with l3lab and there is no
> differences on rendering time between the triangle version and quad version of my disc.
>
> Does someone know how quads are drawing by rendering programs : as a real quad, or as two triangles ?
L3Lab draws a quad as two triangles.
You can see this yourself, when you turn off dither-transparency and use true transparency.
Because the two triangles share a side, the quad-division line gets drawn twice
and is therefore darker.
I use two triangles because L3P already divided quads into triangles for POV,
and does the necessary bow-tie fixing.
Besides I saved implementing a polyfill routine :-)
> PS, By using quads, you get smaller files.
True, and fewer vertex transformations (matrix-vector multiplies) and half the color setup.
However, L3Lab's bottleneck is the actual drawing of the lines/triangles (90% of the time).
so the savings are hard to measure.
/Lars
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Message is in Reply To:
 | | Re: Performance Improvement
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| Hi Well, i think it's also possible to substitue some quads to the triangles. But i've made some tests with l3lab and there is no differences on rendering time between the triangle version and quad version of my disc. Does someone know how quads are (...) (24 years ago, 15-Apr-00, to lugnet.cad.dev)
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