Are the spheres reflecting the point light(s) to the ground...?
Is the checkered plane transparent...?

Mark Wagner wrote:

> Matt Giwer wrote in message <389BD097.7720A07E@ij.net>...
> >Mark Wagner wrote:
> >
> >> Note the colors of the spheres.
> >> Note the colors on the ground.
> >>
> >> How was this done?
> >
> >    Colored lights layed out with the color of the
> >light a mirror image of the colors of the spheres.
>
> No.  The spheres are all white.
>
> Mark

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On Sun, 6 Feb 2000 00:36:43 -0500, Mark Wagner wrote:
>
>Matt Giwer wrote in message <389BD097.7720A07E@ij.net>...
>>Mark Wagner wrote:
>>
>>> Note the colors of the spheres.
>>> Note the colors on the ground.
>>>
>>> How was this done?
>>
>>    Colored lights layed out with the color of the
>>light a mirror image of the colors of the spheres.
>
>
>No.  The spheres are all white.

I assume you used light groups.  The "red" sphere is set to interact with
the red light (and the yellow and magenta lights) and set to block light
from all but the red light.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html

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On Sun, 6 Feb 2000 00:37:03 -0500, "Mark Wagner"
<mar### [at] gtenet> wrote:

>
>Peter Popov wrote in message ...
>>The spheres have no_shadow and there are 7 spotlights (one is
>>negative) of equal radius and falloff?
>
>
>No, only point lights were used.
>
>Mark

intersection
{
  union
  {
    sphere { 2*x, 1 pigment { Red } }
    sphere { 2*x, 1 rotate 60*y pigment { Yellow } }
    ...
  }
  plane { y, 0 }
  pigment { White }
}

?

This should report the CSG as a single infinite object (untested).


Peter Popov
pet### [at] usanet
ICQ: 15002700

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Ron Parker wrote in message ...
>I assume you used light groups.  The "red" sphere is set to interact with
>the red light (and the yellow and magenta lights) and set to block light
>from all but the red light.


Close, but no cigar.

Mark

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Simen Kvaal wrote in message <389eefc9@news.povray.org>...
>You used six lights whose colors add up to 1 and placed them above the
>spheres, so that the spheres appear to be transparent when you look at the
>shawows. Right?
>
Wrong.

Mark

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Peter Popov wrote in message ...
>intersection
>{
>  union
>  {
>    sphere { 2*x, 1 pigment { Red } }
>    sphere { 2*x, 1 rotate 60*y pigment { Yellow } }
>    ...
>  }
>  plane { y, 0 }
>  pigment { White }
>}
>
>?
>
>This should report the CSG as a single infinite object (untested).



Yes, it is reported as a single object.  No, it is not reported as infinite.
No, this is not how I did it.

Mark

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On Tue, 8 Feb 2000 01:16:26 -0500, "Mark Wagner"
<mar### [at] gtenet> wrote:

>>No, this is not how I did it.

I am sure someone with more math brains than myself can come up with
an isosurface function to colorise the floor plane in this way.


Peter Popov
pet### [at] usanet
ICQ: 15002700

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sphere { <1,0,0> 0.5 pigment { rgb 1 } light_group "one" }
light_source { <1,3000,0> rgb <1,0,0> groups "one"
                      projected_through { sphere { <1,0,0> 0.51 } light
group "one" }

This at least creates the same effect, but the colors get washed out.
Perhaps you fix this with radiosity?

Mark Wagner wrote:

> Note the colors of the spheres.
> Note the colors on the ground.
>
> How was this done?
>
> Mark
>
>  [Image]

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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/*
Josh English wrote in message <38A### [at] spiritonecom>...
>sphere { <1,0,0> 0.5 pigment { rgb 1 } light_group "one" }
>light_source { <1,3000,0> rgb <1,0,0> groups "one"
>                      projected_through { sphere { <1,0,0> 0.51 } light
>group "one" }
>
>This at least creates the same effect, but the colors get washed out.
>Perhaps you fix this with radiosity?


Get rid of the projected_through and you've got it.

The source:
*/
sphere{<2,0,0>, 1 light_group "A" pigment{rgb 1} rotate y*60}
sphere{<2,0,0>, 1 light_group "B" pigment{rgb 1} rotate y*120}
sphere{<2,0,0>, 1 light_group "C" pigment{rgb 1} rotate y*180}
sphere{<2,0,0>, 1 light_group "D" pigment{rgb 1} rotate y*240}
sphere{<2,0,0>, 1 light_group "E" pigment{rgb 1} rotate y*300}
sphere{<2,0,0>, 1 light_group "F" pigment{rgb 1} rotate y*0}
sphere{<0,0,0>, 1 light_group "G" pigment{rgb 1} }

plane{y, -6 pigment{checker rgb 1, rgb .9 }}

light_source{ <100,300,0>*100, red 1   groups "C,D,E,G"  rotate y*240}
light_source{ <100,300,0>*100, green 1 groups "E,F,A,G"  rotate y*0}
light_source{ <100,300,0>*100, blue 1  groups "A,B,C,G"  rotate y*120}

camera{ location <0,5,10> look_at y*-2}
/* The colors come from color addition and color subtraction.*/

/* Mark */

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OOOOH.. I was so close. Projected_through was the only way I could get the
shadow to be colored properly, with out it the colors of the shadows seemed
to be rotated 180*y under their spheres....

I personally want to thank you for posting a challenge that forced me to
look into the newer features of MegaPov that I probably wouldn't have looked
at before. It was a learning experience.

Mark Wagner wrote:

> /*
> Josh English wrote in message <38A### [at] spiritonecom>...
> >sphere { <1,0,0> 0.5 pigment { rgb 1 } light_group "one" }
> >light_source { <1,3000,0> rgb <1,0,0> groups "one"
> >                      projected_through { sphere { <1,0,0> 0.51 } light
> >group "one" }
> >
> >This at least creates the same effect, but the colors get washed out.
> >Perhaps you fix this with radiosity?
>
> Get rid of the projected_through and you've got it.
>
> The source:
> */
> sphere{<2,0,0>, 1 light_group "A" pigment{rgb 1} rotate y*60}
> sphere{<2,0,0>, 1 light_group "B" pigment{rgb 1} rotate y*120}
> sphere{<2,0,0>, 1 light_group "C" pigment{rgb 1} rotate y*180}
> sphere{<2,0,0>, 1 light_group "D" pigment{rgb 1} rotate y*240}
> sphere{<2,0,0>, 1 light_group "E" pigment{rgb 1} rotate y*300}
> sphere{<2,0,0>, 1 light_group "F" pigment{rgb 1} rotate y*0}
> sphere{<0,0,0>, 1 light_group "G" pigment{rgb 1} }
>
> plane{y, -6 pigment{checker rgb 1, rgb .9 }}
>
> light_source{ <100,300,0>*100, red 1   groups "C,D,E,G"  rotate y*240}
> light_source{ <100,300,0>*100, green 1 groups "E,F,A,G"  rotate y*0}
> light_source{ <100,300,0>*100, blue 1  groups "A,B,C,G"  rotate y*120}
>
> camera{ location <0,5,10> look_at y*-2}
> /* The colors come from color addition and color subtraction.*/
>
> /* Mark */

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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