Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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update for "1-8sphc.dat"
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Newsgroups:
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lugnet.cad.dat.parts.primitives
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Date:
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Thu, 28 Sep 2000 04:14:15 GMT
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Viewed:
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1067 times
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Let's try this again..... :-P
[fx: chainsaw]
I'll just carve out this MIME stuff...
[/fx]
[fx: jackhammer]
...And I'll just insert this DAT file (as text) at the end here...
[/fx]
Thanks! ;-)
Franklin
--- LUGNET Server <news-bouncer@lugnet.com> wrote:
>
> Your message could not be accepted.
> Response from the news server:
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>
> |Travis,
> |"Hmmm... Let me check my notes..." [1]
> |Thanks!
> |
> |
> |Steve,
> |Please give this corrected version to the "primitives panel".
> |Thanks!
> |
> |
> |Thanks, again,
> |Franklin
> |
> |
> |[1] Bonus cookie if you can correctly identify this reference! ;-)
> |
> |
> |--- Travis Cobbs <tcobbs@falcon.csc.calpoly.edu> wrote:
> |> Hi, I was looking at your 1-8sphc.dat primitive, and noticed something
> |> you might want to change. When I scaled it by .707 and then drew it
> |> over my hi-res (48) tesselation of a sphere, I noticed that it had a lot
> |> of area that fell slightly outside the sphere. I looked in the file,
> |> and I noticed that you were using .882 in places where I think you
> |> wanted to use .866 (sqrt(0.75)). You always use two .882s and a .707
> |> together in a point. If you do the following:
> |>
> |> .882^2 + .882^2 + .707^2
> |>
> |> you get 2.056. This gives you a distance from <0,0,0> of 1.434. If you
> |> instead do this:
> |>
> |> .866^2 + .866^2 + .707^2
> |>
> |> you get 2.000 (1.999761, to be exact). This of course gives you a
> |> distance from <0,0,0> of 1.414, which is what you are looking for in a
> |> sphere with radius 2^.5.
0 1/8 Sphere Cut Off
0 Author: Franklin W. Cain (fwcain@yahoo.com)
0 Unofficial Primitive
0
0 COMMENT This figure is the intersection of
0 COMMENT a) one octant (1/8th) of a sphere
0 COMMENT whose radius is "the square root of two"
0 COMMENT (i.e. radius = 2^0.5) and whose focus (center)
0 COMMENT is the origin point (0,0,0)
0 COMMENT and
0 COMMENT b) a cube whose length is "one" (i.e. box.dat)
0 COMMENT and which has (0,0,0) and (1,1,1)
0 COMMENT as opposing corners
0 COMMENT leaving only the sphere's surface.
0 COMMENT Each edge is circular and fits with a 1-4edge.dat.
0
3 16 .866 .866 .707 .866 .707 .866 .707 .866 .866
0
3 16 1 .707 .707 .866 .866 .707 .866 .707 .866
3 16 .707 1 .707 .866 .866 .707 .707 .866 .866
3 16 .707 .707 1 .707 .866 .866 .866 .707 .866
0
3 16 1 .924 .383 1 .707 .707 .866 .866 .707
3 16 1 .383 .924 1 .707 .707 .866 .707 .866
3 16 .924 1 .383 .707 1 .707 .866 .866 .707
3 16 .383 1 .924 .707 1 .707 .707 .866 .866
3 16 .924 .383 1 .707 .707 1 .866 .707 .866
3 16 .383 .924 1 .707 .707 1 .707 .866 .866
0
3 16 1 .924 .383 .924 1 .383 .866 .866 .707
3 16 1 .383 .924 .924 .383 1 .866 .707 .866
3 16 .383 1 .924 .383 .924 1 .707 .866 .866
0
3 16 1 1 0 1 .924 .383 .924 1 .383
3 16 1 0 1 1 .383 .924 .924 .383 1
3 16 0 1 1 .383 1 .924 .383 .924 1
0
5 24 .866 .866 .707 .866 .707 .866 1 .707 .707 .707 .866 .866
5 24 .866 .866 .707 .707 .866 .866 .707 1 .707 .866 .707 .866
5 24 .866 .707 .866 .707 .866 .866 .707 .707 1 .866 .866 .707
0
5 24 1 .707 .707 .866 .866 .707 1 .924 .383 .866 .707 .866
5 24 1 .707 .707 .866 .707 .866 1 .383 .924 .866 .866 .707
5 24 .707 1 .707 .866 .866 .707 .924 1 .383 .707 .866 .866
5 24 .707 1 .707 .707 .866 .866 .383 1 .924 .866 .866 .707
5 24 .707 .707 1 .707 .866 .866 .383 .924 1 .866 .707 .866
5 24 .707 .707 1 .866 .707 .866 .924 .383 1 .707 .866 .866
0
5 24 1 .924 .383 .866 .866 .707 .924 1 .383 1 .707 .707
5 24 .924 1 .383 .866 .866 .707 1 .924 .383 .707 1 .707
5 24 1 .383 .924 .866 .707 .866 .924 .383 1 1 .707 .707
5 24 .924 .383 1 .866 .707 .866 1 .383 .924 .707 .707 1
5 24 .383 1 .924 .707 .866 .866 .383 .924 1 .707 1 .707
5 24 .383 .924 1 .707 .866 .866 .383 1 .924 .707 .707 1
0
5 24 1 .924 .383 .924 1 .383 1 1 0 .866 .866 .707
5 24 1 .383 .924 .924 .383 1 1 0 1 .866 .707 .866
5 24 .383 1 .924 .383 .924 1 0 1 1 .707 .866 .866
0
=====
Franklin Cain (and please do *not* call me "Frank" ;-)
fwcain@yahoo.com | http://fcain.tripod.com/
------------------------------------------------------------
USE OR DISTRIBUTION OF MY EMAIL ADDRESS FOR UNSOLICITED
COMMERCIAL PURPOSES (I.E., SPAM) IS STRICTLY PROHIBITED.
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