Subject:
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Re: Sphere tesselation
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 11 Sep 2000 13:46:18 GMT
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Viewed:
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1251 times
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In lugnet.cad.dev, Travis Cobbs wrote:
> Does anyone know how to perform an arbitrary sphere tesselation which ends
> up with the tesselation used by the LDraw sphere primitives when set to a
> detail level of 16 (16 being the number of facets around the circumference
> at the equator).
Nope, sorry.
> I want to do a primitive substitution for the 1-8SPHE.DAT primitive, but I'd
> really rather not have to hard-code the points. It would be nice at some
> point in the future to be able to increase the complexity and still have my
> spheres and cylinders meet exactly.
>
> To be perfectly honest, I'm not even sure what higher tesselation values
> should result in. The p\48 directory doesn't contain the sphere primitive.
> Of course, if I get a tesselation routine, I will be able to CREATE one to
> put in there, but the fact that there isn't one there now means I'm not even
> sure what it should look like. All I know is that the three outer edges
> would have 12 facets each.
I don't think James used any particular algorithm when he selected points
for the sphere p-files.
At some point, I'd like to replace the sphere p-files with something
better-looking. Something like the 48\1-8sphe.dat I posted (see
<http://news.lugnet.com/cad/dat/parts/primitives/?n=39>), but with only 5
vertices on each edge, to fit with the standard curved p-files.
Steve
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Message has 1 Reply:
 | | Re: Sphere tesselation
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| "Steve Bliss" <steve.bliss@home.com> wrote in message news:ppnprssksi9anl3...4ax.com... (...) How did you generate this file? It certainly looks like it was algorithmically generated. Don't tell me you figured out all those points BY HAND? I did (...) (26 years ago, 11-Sep-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Sphere tesselation
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| Does anyone know how to perform an arbitrary sphere tesselation which ends up with the tesselation used by the LDraw sphere primitives when set to a detail level of 16 (16 being the number of facets around the circumference at the equator). I'll (...) (26 years ago, 9-Sep-00, to lugnet.cad.dev)
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