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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Tue, 12 Sep 2000 14:29:42 GMT
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Viewed:
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488 times
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In lugnet.cad.dev, Travis Cobbs wrote:
> "Steve Bliss" <steve.bliss@home.com> wrote in message
> news:ppnprssksi9anl3hi45qgq5kkbarndid1n@4ax.com...
> > In lugnet.cad.dev, Travis Cobbs wrote:
> >
> > 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.
>
> 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?
It was a fractal-thingy--it started with a 10-vertex triangular mesh (the
three points on the axes, two points along each edge, and the point at the
center of the surface of the hemi-demi-semi-sphere). Then it divided each
triangle in the mesh into 4 subtriangles. To figure the new points, it
found the midpoint of each edge, and projected that point onto the surface
of the unit sphere. These divisions were repeated for a specified number
of iterations.
I'm not sure why I started with the 10-mesh that I did. It would have been
a lot less code to start with just the 3 points on the axes. Maybe I
wanted to have that center-point?
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:f5csrssq9rkotte...4ax.com... (...) 5 (...) points (...) Thanks for the info. The next thing I'm going to try will be similar, but iterative instead of recursive in order to allow for a set (...) (24 years ago, 12-Sep-00, to lugnet.cad.dev)
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Message is in Reply To:
| | 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 (...) (24 years ago, 11-Sep-00, to lugnet.cad.dev)
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