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 21:50:59 GMT
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Viewed:
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4800 times
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In lugnet.cad.dat.parts, Don Heyse wrote:
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In lugnet.cad.dat.parts, Steve Bliss wrote:
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In lugnet.cad.dat.parts, Niels Karsdorp wrote:
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Wedge part 45407 (Wedge 4 x 4 with 1 x 4 Side Plates) has similar
sloped sides as wedge parts 43720 and 43721  . When I
examined these parts in LDView, I noticed that the control points for the
conditional lines on the sloped surface might be wrong:
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I don’t think it’s the control points. I took a quick look at the file,
actually just one of the lines, the first in the file. The control points
used are the two unattached vertices from the triangles adjacent to the
conditional edge. That should be exactly right.
It might be more the way the sloped surface is designed. These two images
show how the conditional lines are sometimes “half-needed”:
I suspect that LDraw cannot outline this surface exactly correctly -- but I
haven’t thought it through yet; I could be wrong.
A finer-grained surface, with more polygons, would work better. But would
still have the problem of ‘half-needed’ conditional lines.
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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”.
ROSCO
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