Subject:
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Re: Question: polygons filling a t-shape
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 4 Dec 2003 04:27:47 GMT
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Viewed:
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455 times
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In lugnet.cad, Larry Pieniazek wrote:
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But I thought that (rgarding quad 2 in the last diagram) collinear points
were considered an error by the checkers, so that when you submit your part
to parts tracker it would be flagged???
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I’m not sure if it does or not.
After posting the previous post, I realized that I was mistaken about my
alternate version being “ok”. I just realized that it could result in the same
rendering artifacts that using a triangle for polygon 2 would produce. The
reason for this is that rendering hardware will split the quad into two
triangles prior to rendering.
There are two ways to split the quad, one that would be fine, and the other that
would result in a triangle and a line. There’s no way to tell the hardware
which way to split. The triangle/line split could produce a rendering artifact,
although the artifact probably wouldn’t be a gap, but a kind of break during
shiny lighting. I’ll have to re-visit my co-linear detection code.
Having realized this, I retract my previous suggestion. My personal opinion
would be that the originally posted solution would be the best way to model a T.
--Travis Cobbs
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Message has 1 Reply:
 | | Re: Question: polygons filling a t-shape
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| (...) Thanks for pointing this out -- I've been bugged for awhile about the "colinear quads are bad just because L3P says they're bad" situation, here's a very good reason to not use them. Steve (21 years ago, 5-Dec-03, to lugnet.cad)
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Message is in Reply To:
| | Re: Question: polygons filling a t-shape
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| (...) Great diagrams, thanks! But I thought that (rgarding quad 2 in the last diagram) collinear points were considered an error by the checkers, so that when you submit your part to parts tracker it would be flagged??? (21 years ago, 4-Dec-03, to lugnet.cad, FTX)
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