Subject:
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Re: Conditional lines on sloped wedge parts 43720 and 43721
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Mon, 18 Apr 2005 22:16:26 GMT
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Viewed:
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4809 times
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In lugnet.cad.dat.parts, Ross Crawford wrote:
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In lugnet.cad.dat.parts, Don Heyse wrote:
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I’m not sure about that. The surface as it’s written is extremely
lumpy, and the conditional lines work as expected given the lumps
in the surface. You also get an ugly shading effect with flat
shading because of those lumps.
There’s gotta be a way to cut the polys through the middle of the
saddle and eliminate the problem. It looks like it might involve
a ring (or torus) primative?
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Well, I thought about this, and what I would try is changing the polygons
thus:
If the top points are A1-5 and the bottom points are B1-5, keep the A2-B1,
A3-B2 as currently, but instead of A2-B2 etc, use A3-B1, A4-B2, etc. I think
that would make all the edges inside curves instead of outside, and eliminate
the need for conditionals. But I’m not sure. And I dunno if it would “look
right”.
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OK, I tried it and realise now that it doesn’t solve the problem at all, just
moves the outside curves to a different spot. I think Don is right, a more
complex torus-like curve is necessary to represent it properly.
ROSCO
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Conditional lines on sloped wedge parts 43720 and 43721
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| (...) Well, I thought about this, and what I would try is changing the polygons thus: If the top points are A1-5 and the bottom points are B1-5, keep the A2-B1, A3-B2 as currently, but instead of A2-B2 etc, use A3-B1, A4-B2, etc. I think that would (...) (20 years ago, 18-Apr-05, to lugnet.cad.dat.parts, FTX)
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