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 10:54:14 GMT
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Viewed:
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501 times
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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)
Niels
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Message has 1 Reply:
 | | Re: Primitives and quads/triangles [DAT]
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| (...) 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 (...) (22 years ago, 16-Oct-02, to lugnet.cad)
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Message is in Reply To:
| | Re: Primitives and quads/triangles
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| (...) 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 (...) (22 years ago, 15-Oct-02, to lugnet.cad)
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