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CFM wrote:
| My POV-ray tutorial told me that if I wanted the sun created by the
| sky_sphere command to emit an apparent shadow through clouds, I'd
have to
| make a really large sky_sphere with the proper texture,and put the
| light_source outside the sky_sphere. How do I do that, since the
tutorial
| never told me? Here's the programming language below I used to
create the
| sky_sphere with the sun and clouds, but the clouds do not cast shadows.
|
	You can't do it with a sky_sphere, since by definition it is infinite
and therefore behind the clouds. So what you do is use a regular
sphere with a large radius and your cloud texture with the blue parts
replaced by a transparent color. Then all you have to do is put your
light source further out. Something like that (the texture will almpst
certainly require tweaking):

sky_sphere {
~  pigment {
~    gradient y
~    color_map {
~      [0,.002 color rgb<1,.2,0>
~              color rgb<1,.2,0>]
~      [.002,.2 color rgb<.8,.1,0>
~               color rgb<.2,.2,.3>]
~    }
~  }
~  scale 2
~  translate -1
}
sphere {
~  0, 1000000000
~  pigment {
~  bozo
~  turbulence .65
~  octaves 6
~  omega .7
~  lambda 2
~  color_map {
~    [0,.1 color rgb<.5,.5,.5>
~          color rgb<.75,.75,.75>]
~    [.1,.5 color rgb<1,1,1>
~           color rgbt<1,1,1,1>]
~    [.5,1  color rgbt<1,1,1,1>
~           color rgbt<1,1,1,1>]
~  }
~  scale .1
~  }
~  rotate -135*x
}

- --
******************************
*      Jerome M. Berger      *
* mailto:jbe### [at] ifrancecom *
*  http://jeberger.free.fr/  *
******************************
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