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Suggestion for the next version of POV:
A torus pattern, like the sphere one, but a torus...
Would be major radius 1, along the X-Y or X-Z plane, with the value
gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
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Larry Fontaine wrote:
>
> Suggestion for the next version of POV:
> A torus pattern, like the sphere one, but a torus...
> Would be major radius 1, along the X-Y or X-Z plane, with the value
> gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
And your argument for the inclusion of this and what benefits it would offer
are ?
This is not a challenge of your suggestion. If you have a valid reason
you think this should be added you should make your request as compelling
as possible. Many requests for new features are posted here but few
follow through with why they think the time should be spent on adding
them.
--
Ken Tyler
See my 1000+ Povray and 3D Rendering and Raytracing Links at:
http://home.pacbell.net/tylereng/index.html
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To keep people like me from using superpatch just to make smoke rings with
media?
Seriously, the only use I can think of (not that this really means anything)
is for media.
Ken <tyl### [at] pacbell net> wrote in message
news:37E### [at] pacbellnet...
>
>
> Larry Fontaine wrote:
> >
> > Suggestion for the next version of POV:
> > A torus pattern, like the sphere one, but a torus...
> > Would be major radius 1, along the X-Y or X-Z plane, with the value
> > gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
>
> And your argument for the inclusion of this and what benefits it would
offer
> are ?
>
>
> This is not a challenge of your suggestion. If you have a valid reason
> you think this should be added you should make your request as compelling
> as possible. Many requests for new features are posted here but few
> follow through with why they think the time should be spent on adding
> them.
>
> --
> Ken Tyler
>
> See my 1000+ Povray and 3D Rendering and Raytracing Links at:
> http://home.pacbell.net/tylereng/index.html
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Like Bill said, main use would probably be media. AARGH, what was my idea?!!?
*5 minutes later* Oh yeah. My original thought came about from the engraving
text on a ring question. A torical pattern could be used along with text objects
in an orthographic view to create a height_field that would be perfect for
engraving the text on the ring. Yes, that was it!!! I remembered!!!
Ken wrote:
> Larry Fontaine wrote:
> >
> > Suggestion for the next version of POV:
> > A torus pattern, like the sphere one, but a torus...
> > Would be major radius 1, along the X-Y or X-Z plane, with the value
> > gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
>
> And your argument for the inclusion of this and what benefits it would offer
> are ?
>
> This is not a challenge of your suggestion. If you have a valid reason
> you think this should be added you should make your request as compelling
> as possible. Many requests for new features are posted here but few
> follow through with why they think the time should be spent on adding
> them.
>
> --
> Ken Tyler
>
> See my 1000+ Povray and 3D Rendering and Raytracing Links at:
> http://home.pacbell.net/tylereng/index.html
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Well, for that, you could use onion or wood pattern. And perhaps a
spherical or cylinderical pigment_map to limit those patterns, or you
could just use multiple objects, or you could use a disk object...
The only place I think a torus pattern could be useful is in media. But
it would be extremely useful there. (flourescent bulbs, dust rings from
a shock wave, etc...)
BTW, doesn't the Superpatch already have a toroidal pattern? Of course,
with the Superpatch, you can make any pattern with the isosurface
functions used as patterns.
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It's not too hard to determine distance from a circle, but you do
realize that a repeating torus pattern would look a little funny near
the axis of symmetry...
Xander
Larry Fontaine wrote:
>
> Suggestion for the next version of POV:
> A torus pattern, like the sphere one, but a torus...
> Would be major radius 1, along the X-Y or X-Z plane, with the value
> gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
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On Thu, 16 Sep 1999 05:57:26 -0500, Chris Huff wrote:
>The only place I think a torus pattern could be useful is in media. But
>it would be extremely useful there. (flourescent bulbs, dust rings from
>a shock wave, etc...)
Even there, it's of limited usefulness if it has a fixed major radius.
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Ron Parker <par### [at] fwicom> wrote :
>
> Even there, it's of limited usefulness if it has a fixed major radius.
>
Maybe I don't know what you mean. I was just thinking that I would be
happy with a major radius of 1 and a minor radius of 1. Everything else can
be done with density and scale. As long as the density starts at 1 along the
focus of the minor radius and goes to 0 and stays there.
Isosurface torus pretty much requires a toroidal container which means
that you cannot combine it with another media in the same container.
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On Thu, 16 Sep 1999 09:59:38 -0400, Buckaroo Bill wrote:
>
>Ron Parker <par### [at] fwicom> wrote :
>>
>> Even there, it's of limited usefulness if it has a fixed major radius.
>>
>
> Maybe I don't know what you mean. I was just thinking that I would be
>happy with a major radius of 1 and a minor radius of 1. Everything else can
>be done with density and scale. As long as the density starts at 1 along the
>focus of the minor radius and goes to 0 and stays there.
The problem is that if I want a toroidal density pattern with a major radius
of 1 and a minor radius of .1, I have to scale the pattern by 100 and then
put my entire color map into the range [0 .. 0.001] That doesn't scale very
well.
> Isosurface torus pretty much requires a toroidal container which means
>that you cannot combine it with another media in the same container.
Really? Are you sure?
//------------ cut here --------->8=========
#declare myfun=function{max(0,1-sqrt( y*y + sqr(sqrt(x*x+z*z)-5)))}
sphere { 0,6.1 hollow
interior { media {
density {function {myfun}}
emission .2 intervals 10 samples 5 5
}}
texture {pigment {color rgbt 1}}
}
light_source {<-20,20,-20> rgb 1}
camera {location <0,5,-10> look_at 0}
//------------ cut here --------->8=========
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Ron Parker <par### [at] fwicom> wrote
>
> Really? Are you sure?
>
Well, no, I wasn't sure (I should include a standard disclaimer whenever
I say any thing about POV and especially Isosurface). I had read someone's
recommendation (maybe your's?) to use max() but hadn't had a chance to try
it yet. Too many things on too few burners. Thanks.
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