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On Wed, 26 May 2004 05:24:11 -0400, "David Wallace" <dar### [at] earthlink net>
wrote:
> Sorry, generating meshes from splines is not trivial, especially when you
> have a parametric surface with u = "clock value" and v going around the
> spline.
I'm not sure I understand you. If u=clock then it is constant per scene (if it
is clock of animation). If you mean u=clock as being parameter of the spline
then most probably you mean different spline as for v parameter.
> The issue comes from finding a consistent "normal" vector to the
> spline to start the mesh circle.
If the spline is closed then finding normal at the end is equally difficult on
start/end as in the middle. Just input for calculating it changes, but
algorithm is the same. I coded it a few times and I'm pretty sure it was done
similar way in http://members.home.nl/seedseven/#param and
http://members.home.nl/seedseven/#lathe as well. Of course those are not
perfect solution but non approximation if perfect.
ABX
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Again, are there any macros available to create mesh *prisms*? So far I
have only heard talk about lathes and sors... Prisms are more difficult
in my opinion.
Rune
--
3D images and anims, include files, tutorials and more:
rune|vision: http://runevision.com **updated Apr 27**
POV-Ray Ring: http://webring.povray.co.uk
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On Wed, 26 May 2004 12:28:14 +0200, "Rune" <run### [at] runevisioncom> wrote:
> Again, are there any macros available to create mesh *prisms*? So far I
> have only heard talk about lathes and sors... Prisms are more difficult
> in my opinion.
Obviously.
ABX
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My interpretation of an n-sided prism mesh is a 4 by n structure:
Row 1: Radius 0, initial center
Row 2: Radius r, initial center
Row 3: Radius r, final center
Row 4: Radius 0, final center
What is your interpretation?
"Rune" <run### [at] runevisioncom> wrote in message
news:40b47129$1@news.povray.org...
> Again, are there any macros available to create mesh *prisms*? So far I
> have only heard talk about lathes and sors... Prisms are more difficult
> in my opinion.
>
> Rune
> --
> 3D images and anims, include files, tutorials and more:
> rune|vision: http://runevision.com **updated Apr 27**
> POV-Ray Ring: http://webring.povray.co.uk
>
>
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in news:40bc2a45@news.povray.org David Wallace wrote:
> Row 1: Radius 0, initial center
> Row 2: Radius r, initial center
> Row 3: Radius r, final center
> Row 4: Radius 0, final center
>
>
|------\
|_____ \
| \
| |
+ | |
| |
______| /
| /
|_______/
This is the kind of situation Rune is referring to, I think.
Ingo
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On 1 Jun 2004 03:42:20 -0400, ingo <ing### [at] tagpovrayorg> wrote:
> |------\
> |_____ \
> | \
> | |
> + | |
> | |
> ______| /
> | /
> |_______/
>
> This is the kind of situation Rune is referring to, I think.
I think the most difficoult problem is hole within prism (subshape):
________
/ \
/ /\ \
| / \ |
| \ / |
| \/ |
\ /\ /
\__/ \__/
as in http://www.povray.org/documentation/view/50/#s03_04_03_03
ABX
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