Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Overlapping polygons etc
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 6 Aug 2003 00:23:56 GMT
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Viewed:
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551 times
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In lugnet.cad, Ross Crawford wrote:
> Thanks for your replies!
>
> In lugnet.cad, Paul Easter wrote:
> > In lugnet.cad, Orion Pobursky wrote:
> > > In lugnet.cad, Ross Crawford wrote:
>
> snip...
>
> > > >
> > > > 2. Should primitives be used where they aren't exactly right, but close enough?
> > > > There's a couple of situations with this part:
> > > > a) cylinder (stud) meets horizontal plane, but plane doesnt intersect
> > > > completely, the 3-4edge primitive is very close to providing the correct
> > > > intersection line, but it's a tiny bit too big, should I use it or manually do
> > > > the intersection, which would mean some renderers which substitute the stud may
> > > > not render very well.
> > >
> > >
> > > In this case I'd say inline the primitive and trim
> >
> > Yes, I agree, or use the next smaller segment primitive 1-2edge.dat and rotate
> > it while also placing the other lines manually(or from inlining).
>
> You mean inline the stud2a, then inline a cylinder under it and trim that?
I think I missed what you meant earlier.
I would not inline the stud for that, Unless it was a major piece of the part.
which this is not.
> > > >
> > > > b) Open wall ends of 2-4cyli touch outside wall of part - some renderers may
> > > > show vertical lines on outside wall. However in this case, the cylinder butts up
> > > > against the bottom of a stud2a, so if I manually do the cylinder, renderers that
> > > > substitute the stud may look strange with the un-substituted cylinder below it.
Ok, I see it now. My laptop screen was not showing me enough detail.
See my example below. I used a 3-8cyli file instead.
As for the edge lines. Unless we are all perfectionists, which I usually am with
small parts, I would use the edge primitves as used below unless someone has a
big complaint about it.
If you make this part as a few small sub-parts. Then save a copy of that file,
fixing problems that are repetitive is done easily and inlined.
> snip...
> > I think what he is talking about is "blocky" rendering like in POV where quads
> > meet a cylinder.
> > If this is the case, I would use a rotated 1-4cyli or two 1-4cyli and let them
> > overlap some into the wall.
>
> Well yes and no - that sentence actually asked 2 different questions :) but both
> will be solved if I inline the studs and trim the cylinders as Orion suggested
> (I think).
I actually would not recommend that.
>
> Thanks for your help guys! (Even if it means more work for me...)
>
> ROSCO
Paul
Example below:
1 16 0 4 10 1 0 0 0 2 0 0 0 1 stud2a.dat
1 16 0 4 10 4.2426 0 4.2426 0 1 0 -4.2426 0 4.2426 3-4edge.dat
1 16 0 4 10 5.5433 0 -2.2961 0 12 0 -2.2961 0 -5.5433 3-8cyli.dat
1 16 0 16 10 5.5433 0 -2.2961 0 1 0 -2.2961 0 -5.5433 3-8edge.dat
1 16 0 4 10 4 0 0 0 1 0 0 0 4 4-4edge.dat
1 16 0 4 10 4.243 0 4.243 0 1 0 -4.243 0 4.243 3-4edge.dat
1 16 -10 10 6 5.5 0 0 0 0 6 0 1 0 rect.dat
0 reference info
1 1 10 10 6 5.5 0 0 0 0 6 0 1 0 rect.dat
4 1 18 4 13 18 4 6 -18 4 6 -18 4 13
4 1 14 4 18 14 4 13 -14 4 13 -14 4 18
4 1 16 16 6 16 16 -6 -16 16 -6 -16 16 6
4 1 14 4 18 14 0 18 -14 0 18 -14 4 18
2 2 14 0 18 -14 0 18
4 1 14 0 18 16 0 20 -16 0 20 -14 0 18
2 2 16 0 20 -16 0 20
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Message has 2 Replies:
 | | Re: Overlapping polygons etc
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| (...) OK, I'm happy to do that. (...) Thanks for the suggestion! But I have another question, which I alluded to originally, but forgot about: What about the horizontal planes going down either side, and slicing through the studs, where they join (...) (21 years ago, 6-Aug-03, to lugnet.cad)
| | | Re: Overlapping polygons etc
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| (...) OK, using your example as a guide, I finished off the part. First cut is at (URL) did notice, though, that using LDview, there is a definite line where the studs join the cylinders. I tried rotating the studs by 22.5 degrees to match, but the (...) (21 years ago, 6-Aug-03, to lugnet.cad)
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Message is in Reply To:
| | Re: Overlapping polygons etc
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| Thanks for your replies! (...) OK. I just thought with 24 studs being affected, the large increase in polygons may be a bad idea, but it's better to get it right. (...) AFAIK this part is only available in black, but better safe than sorry. (...) (...) (21 years ago, 5-Aug-03, to lugnet.cad)
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