Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Primitives and quads/triangles
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 16 Oct 2002 17:58:32 GMT
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Viewed:
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1524 times
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In lugnet.cad, Niels Karsdorp writes:
> In lugnet.cad, Travis Cobbs writes:
> > In lugnet.cad, Niels Karsdorp writes:
> > > When I was working on the old Type I trainbase 6 x 12,
> > > I also wanted correct wheels for this part. Since I have
> > > these, I tried to create the wheel. In my first attempt
> > > I used primitives only, but the cones looked horrible
> > > when rendered. In my seccond attempt I created a small
> > > segment (of 5.625 degrees) and created a whole wheel
> > > of 64 segments. This part contains over 700 quads and
> > > over 700 lines. In a third attempt I used primitives
> > > for discs, rings and cylinders, and quad-segments for
> > > the cones (64 segments in a circle).
> >
> > While your goal is to create something that looks good after L3P has
> > converted it to POV format, bear in mind that it should ideally also look
> > good in the original LDraw format. Using primitives for the cylinders, and
> > not for the cones will cause problems when rendered with a standard LDraw
> > renderer.
> >
> > I would agree with Tore's suggestion to use the 0 IFPOV method. Use
> > primitives for both the cylinders and cones to look as good as possible with
> > standard renderers, and 0 IFPOV to look great in POV. This would of course
> > require more work on your part.
> >
> > I do have one question, though. I notice that the new-style train wheel
> > appears to use one cone for each conical section, while you obviously used
> > multiple. Is that because they are different sized cones? Also, are yours
> > not quite the right size? There are gaps visible, and if the cones met up
> > exactly I don't think the gaps would be visible.
>
> The new-style train wheel (4180d.dat) does not use cones, but quads.
> This causes gaps when rendered (see on my site).
> Since there was not a single matching cone primitive, I used three.
> I know about the gaps between these cones. Because of the gaps between
> the outer edge of the cone and the surrounding cylinder, I did not spend
> more time on alligning the three cones.
>
> I will try to learn more about POV and create two versions of the wheel
> in one file, using 0 IFPOV etc., so the part will look good in both
> LDraw viewers and POV renders.
>
> (I just received some old 4-stud trainwheels, so these will be added
> to my to-do-list, too)
I have created a fourth version, using primitives for cylinders and rings.
Cones I have created with 16 segment quads for LDraw and a true cone for
PovRay (using 0 L3P IFPOV etc.). The results are great!
Now I need to find out how type 5 lines are created......
My wheel so far is:
(The cone at the front needs type 5 lines)
0 Train Wheel Car Type II
0 Name: xxxxx.dat
0 Author: Niels Karsdorp
0 Axle connector
1 16 0 0 -8 4 0 0 0 0 4 0 4 0 4-4disc.dat
1 16 0 0 10 4 0 0 0 0 4 0 -18 0 4-4cyli.dat
1 16 0 0 10 8 0 0 0 0 8 0 -2 0 4-4cyli.dat
1 16 0 0 10 4 0 0 0 0 4 0 4 0 ring1.dat
1 16 0 0 -8 4 0 0 0 0 4 0 4 0 4-4edge.dat
1 16 0 0 10 4 0 0 0 0 4 0 4 0 4-4edge.dat
1 16 0 0 10 8 0 0 0 0 8 0 8 0 4-4edge.dat
0 Wheel 'flens' rear
1 16 0 0 8 4 0 0 0 0 4 0 4 0 ring2.dat
1 16 0 0 8 2 0 0 0 0 2 0 2 0 4-4ring6.dat
1 16 0 0 8 14 0 0 0 0 14 0 14 0 ring1.dat
1 16 0 0 8 8 0 0 0 0 8 0 8 0 4-4edge.dat
1 16 0 0 8 28 0 0 0 0 28 0 28 0 4-4edge.dat
0 Wheel 'flens' edge
1 16 0 0 8 28 0 0 0 0 28 0 -2 0 4-4cyli.dat
1 16 0 0 6 28 0 0 0 0 28 0 28 0 4-4edge.dat
0 Wheel 'flens' cone
0 L3P IFPOV
0 cone{<0,0,6>,28 <0,0,3>,20 open}
0 L3P ELSEPOV
4 16 20 0 3 18.48 -7.65 3 25.87 -10.72 6 28 0 6
5 24 20 0 3 28 0 6 18.48 -7.65 3 18.48 7.65 3
4 16 18.48 -7.65 3 14.14 -14.14 3 19.8 -19.8 6 25.87 -10.72 6
5 24 18.48 -7.65 3 25.87 -10.72 6 14.14 -14.14 3 20 0 3
4 16 14.14 -14.14 3 7.65 -18.48 3 10.72 -25.87 6 19.8 -19.8 6
5 24 14.14 -14.14 3 19.8 -19.8 6 7.65 -18.48 3 18.48 -7.65 3
4 16 7.65 -18.48 3 0 -20 3 0 -28 6 10.72 -25.87 6
5 24 7.65 -18.48 3 10.72 -25.87 6 0 -20 3 14.14 -14.14 3
4 16 0 -20 3 -7.65 -18.48 3 -10.72 -25.87 6 0 -28 6
5 24 0 -20 3 0 -28 6 -7.65 -18.48 3 7.65 -18.48 3
4 16 -7.65 -18.48 3 -14.14 -14.14 3 -19.8 -19.8 6 -10.72 -25.87 6
5 24 -7.65 -18.48 3 -10.72 -25.87 6 -14.14 -14.14 3 0 -20 3
4 16 -14.14 -14.14 3 -18.48 -7.65 3 -25.87 -10.72 6 -19.8 -19.8 6
5 24 -14.14 -14.14 3 -19.8 -19.8 6 -18.48 -7.65 3 -7.65 -18.48 3
4 16 -18.48 -7.65 3 -20 0 3 -28 0 6 -25.87 -10.72 6
5 24 -18.48 -7.65 3 -25.87 -10.72 6 -20 0 3 -14.14 -14.14 3
4 16 -20 0 3 -18.48 7.65 3 -25.87 10.72 6 -28 0 6
5 24 -20 0 3 -28 0 6 -18.48 7.65 3 -18.48 -7.65 3
4 16 -18.48 7.65 3 -14.14 14.14 3 -19.8 19.8 6 -25.87 10.72 6
5 24 -18.48 7.65 3 -25.87 10.72 6 -14.14 14.14 3 -20 0 3
4 16 -14.14 14.14 3 -7.65 18.48 3 -10.72 25.87 6 -19.8 19.8 6
5 24 -14.14 14.14 3 -19.8 19.8 6 -7.65 18.48 3 -18.48 7.65 3
4 16 -7.65 18.48 3 0 20 3 0 28 6 -10.72 25.87 6
5 24 -7.65 18.48 3 -10.72 25.87 6 0 20 3 -14.14 14.14 3
4 16 0 20 3 7.65 18.48 3 10.72 25.87 6 0 28 6
5 24 0 20 3 0 28 6 7.65 18.48 3 -7.65 18.48 3
4 16 7.65 18.48 3 14.14 14.14 3 19.8 19.8 6 10.72 25.87 6
5 24 7.65 18.48 3 10.72 25.87 6 14.14 14.14 3 0 20 3
4 16 14.14 14.14 3 18.48 7.65 3 25.87 10.72 6 19.8 19.8 6
5 24 14.14 14.14 3 19.8 19.8 6 18.48 7.65 3 7.65 18.48 3
4 16 18.48 7.65 3 20 0 3 28 0 6 25.87 10.72 6
5 24 18.48 7.65 3 25.87 10.72 6 20 0 3 14.14 14.14 3
0 L3P ENDPOV
0 Wheel edge 'loopvlak'
1 16 0 0 3 20 0 0 0 0 20 0 -13 0 4-4cyli.dat
1 16 0 0 3 20 0 0 0 0 20 0 20 0 4-4edge.dat
1 16 0 0 -10 20 0 0 0 0 20 0 20 0 4-4edge.dat
0 Wheel front
1 16 0 0 -10 1 0 0 0 0 -1 0 -1 0 1-4rin19.dat
1 16 0 0 -10 0 0 -1 -1 0 0 0 -1 0 1-4rin19.dat
1 16 0 0 -10 -1 0 0 0 0 1 0 -1 0 1-4rin19.dat
1 16 0 0 -10 0 0 1 1 0 0 0 -1 0 1-4rin19.dat
1 16 0 0 -10 19 0 0 0 0 19 0 19 0 4-4edge.dat
0 L3P IFPOV
0 cone{<0,0,-6>,16 <0,0,-10>,19 open}
0 L3P ELSEPOV
4 16 16.0000 0.0000 -6 14.7821 6.1229 -6 17.5537 7.2710 -10 19.0000 0.0000 -10
4 16 14.7821 6.1229 -6 11.3137 11.3137 -6 13.4350 13.4350 -10 17.5537 7.2710 -10
4 16 11.3137 11.3137 -6 6.1229 14.7821 -6 7.2710 17.5537 -10 13.4350 13.4350 -10
4 16 6.1229 14.7821 -6 0.0000 16.0000 -6 0.0000 19.0000 -10 7.2710 17.5537 -10
4 16 0.0000 16.0000 -6 -6.1229 14.7821 -6 -7.2710 17.5537 -10 0.0000 19.0000 -10
4 16 -6.1229 14.7821 -6 -11.3137 11.3137 -6 -13.4350 13.4350 -10 -7.2710
17.5537 -10
4 16 -11.3137 11.3137 -6 -14.7821 6.1229 -6 -17.5537 7.2710 -10 -13.4350
13.4350 -10
4 16 -14.7821 6.1229 -6 -16.0000 0.0000 -6 -19.0000 0.0000 -10 -17.5537
7.2710 -10
4 16 -16.0000 0.0000 -6 -14.7821 -6.1229 -6 -17.5537 -7.2710 -10 -19.0000
0.0000 -10
4 16 -14.7821 -6.1229 -6 -11.3137 -11.3137 -6 -13.4350 -13.4350 -10 -17.5537
-7.2710 -10
4 16 -11.3137 -11.3137 -6 -6.1229 -14.7821 -6 -7.2710 -17.5537 -10 -13.4350
-13.4350 -10
4 16 -6.1229 -14.7821 -6 0.0000 -16.0000 -6 0.0000 -19.0000 -10 -7.2710
-17.5537 -10
4 16 0.0000 -16.0000 -6 6.1229 -14.7821 -6 7.2710 -17.5537 -10 0.0000
-19.0000 -10
4 16 6.1229 -14.7821 -6 11.3137 -11.3137 -6 13.4350 -13.4350 -10 7.2710
-17.5537 -10
4 16 11.3137 -11.3137 -6 14.7821 -6.1229 -6 17.5537 -7.2710 -10 13.4350
-13.4350 -10
4 16 14.7821 -6.1229 -6 16.0000 0.0000 -6 19.0000 0.0000 -10 17.5537 -7.2710 -10
0 L3P ENDPOV
0 Wheel inside
1 16 0 0 5 16 0 0 0 0 16 0 -11 0 4-4cyli.dat
1 16 0 0 5 8 0 0 0 0 8 0 8 0 ring1.dat
1 16 0 0 5 8 0 0 0 0 8 0 -15 0 4-4cyli.dat
1 16 0 0 -10 8 0 0 0 0 8 0 8 0 4-4disc.dat
1 16 0 0 -6 16 0 0 0 0 16 0 16 0 4-4edge.dat
1 16 0 0 5 16 0 0 0 0 16 0 16 0 4-4edge.dat
1 16 0 0 5 8 0 0 0 0 8 0 8 0 4-4edge.dat
1 16 0 0 -10 8 0 0 0 0 8 0 8 0 4-4edge.dat
1 16 0 0 -10 1 0 0 0 0 -1 0 1 0 stud.dat
0 Spokes
1 16 0.000 12.000 5 0 0 1 4 0 0 0 -11 0 box3#8p.dat
1 16 7.053 9.708 5 -2.35114 0 -0.809017 -3.23607 0 0.587785 0 -11 0 box3#8p.dat
1 16 11.413 3.708 5 -3.80423 0 -0.309017 -1.23607 0 0.951057 0 -11 0 box3#8p.dat
1 16 11.413 -3.708 5 -3.80423 0 0.309017 1.23607 0 0.951057 0 -11 0 box3#8p.dat
1 16 7.053 -9.708 5 -2.35114 0 0.809017 3.23607 0 0.587785 0 -11 0 box3#8p.dat
1 16 0.000 -12.000 5 0 0 1 4 0 0 0 -11 0 box3#8p.dat
1 16 -7.053 -9.708 5 -2.35114 0 -0.809017 -3.23607 0 0.587785 0 -11 0
box3#8p.dat
1 16 -11.413 -3.708 5 -3.80423 0 -0.309017 -1.23607 0 0.951057 0 -11 0
box3#8p.dat
1 16 -11.413 3.708 5 -3.80423 0 0.309017 1.23607 0 0.951057 0 -11 0 box3#8p.dat
1 16 -7.053 9.708 5 -2.35114 0 0.809017 3.23607 0 0.587785 0 -11 0 box3#8p.dat
0
Niels
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Message has 1 Reply:
 | | Re: Primitives and quads/triangles
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| (...) Looks good in my program (LDView), once I got the file modified back to its original form due to the posting causing some lines to wrap. Looking at the file, I think it would require new cone primitives to allow the use of cone primitives (...) (24 years ago, 16-Oct-02, to lugnet.cad)
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Message is in Reply To:
| | Re: Primitives and quads/triangles
|
| (...) The new-style train wheel (4180d.dat) does not use cones, but quads. This causes gaps when rendered (see on my site). Since there was not a single matching cone primitive, I used three. I know about the gaps between these cones. Because of the (...) (24 years ago, 16-Oct-02, to lugnet.cad)
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