Not finished yet, I think it has potential.  Anyone want my spaghetti
code?  
-- 
Dan Johnson 

http://www.geocities.com/zapob

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I was playing with geodesics last week... what does your setup do?

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Bill DeWitt wrote:
> 
>     I was playing with geodesics last week... what does your setup do?

The basic function takes three points two define a spherical triangle. 
Then it divides each of the sides evenly by a number you specify, and
stores them in a two dimensional array. 

x
|\
x-x
|\|\
x-x-x
|\|\|\
x-x-x-x
|\|\|\|\
x-x-x-x-x

The x's are points in the array, and the lines represent how a function
might access the array to find the points of a triangle or edges.  I use
lots of little functions.  One to find points, one to store them in an
array, one to find edges.  I only generate 1/20 of the sphere, and then
rotate it to complete the job.  It also builds an octahedron -
tetrahedron spaceframe onto the group of triangles.  My translation
functions should be able to handle struts other than cylinders
appropriately, so I am trying to think about what I want to replace them
with.  
-- 
Dan Johnson 

http://www.geocities.com/zapob

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That looks really good!

I once read the maths behind geodesic domes, but never got round to actually
trying it. I'd definitely like to see your source.

--
Tek
http://www.evilsuperbrain.com

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"Dan Johnson" <zap### [at] hotmailcom> wrote :
> My translation
> functions should be able to handle struts other than cylinders
> appropriately, so I am trying to think about what I want to replace them
> with.


    What I want to be able to get is something that will divide a solid
sphere into triangles (actually pyramids) so that you have each part go down
to a little point in the center of the sphere.

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Bill DeWitt wrote:
> 
> "Dan Johnson" <zap### [at] hotmailcom> wrote :
> > My translation
> > functions should be able to handle struts other than cylinders
> > appropriately, so I am trying to think about what I want to replace them
> > with.
> 
>     What I want to be able to get is something that will divide a solid
> sphere into triangles (actually pyramids) so that you have each part go down
> to a little point in the center of the sphere.

Do you want the face of the pyramid on the surface to be a curve or a
flat face?  What do you want to do with the pyramids after you have
them?  Do you want them to be csg solids, or triangles, or a solid
triangle mesh?  I could probably adapt my code to do what you want if
you could be specific.
-- 
Dan Johnson 

http://www.geocities.com/zapob

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"Dan Johnson" <zap### [at] hotmailcom> wrote :
>
> I could probably adapt my code to do what you want if
> you could be specific.

    What I really want to do is subdivide an isosurface made with a map of
the Earth so that I can explode it along the geodesics then re-assemble it.
I can do it with a dodecahedron (12 parts?) but I want to do it in much
smaller sections and I don't know how (whimper).

    I would appreciate any help but please don't go too far out of your way.

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Bill DeWitt wrote:
> 
> "Dan Johnson" <zap### [at] hotmailcom> wrote :
> >
> > I could probably adapt my code to do what you want if
> > you could be specific.
> 
>     What I really want to do is subdivide an isosurface made with a map of
> the Earth so that I can explode it along the geodesics then re-assemble it.
> I can do it with a dodecahedron (12 parts?) but I want to do it in much
> smaller sections and I don't know how (whimper).
> 
>     I would appreciate any help but please don't go too far out of your way.

I was going to try, and do that, but the code is being stubborn.  It is
not working in so many strange ways that I have no clue how to debug.  I
am on code writing strike, until I am sane again.  I just uploaded my
code to p.b.s-f.  Hope it helps...
-- 
Dan Johnson 

http://www.geocities.com/zapob

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"Dan Johnson" <zap### [at] hotmailcom> wrote :>
> I was going to try, and do that, but the code is being stubborn.

    Not a problem, I've been working on it off and on for about a year.

> I
> am on code writing strike, until I am sane again.

    I know how that feels. I got sane again once in the middle 80's. A nice
rest but vastly over-rated.

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