Christoph Hormann wrote:
> 
> Interesting.  Does it use uv-mapping?  It is really not visible that it is
> just a 2D texture and with that geometry this is probably quite difficult.

I used slope pattern to select x, y, or z projection of the texture.


> How did you place the area lights?  It is quite astonishing that it looks
> very good without radiosity.

I used net reflectance of 0.3 for the stone which means radiosity
would not make much difference without other objects in the scene.
This was the approximate initial lighting which I fine tuned in
post-process.


sphere{
  <0,0.77,0>,0.77 
  pigment{rgb 1} finish{diffuse 0.3 ambient 0.01}
}

plane{y,0 pigment{checker rgb 1,rgb 0.5 scale 0.8}
finish{diffuse 0.6 ambient 0.01}}

camera{
  location<0,10.8,-23>
  up y right x
  direction 12*z
  look_at<0,0.77,0>
}

light_source{
  <0,0,-23>
  rgb<0.7,1,0.9>*0.8
  area_light 8*x,8*y,4,4 adaptive 0 jitter
  rotate 5*x
  rotate 90*y
}


light_source{
  <0,0,-3>
  rgb<1,0.7,0.4>*0.8
  area_light 0.8*x,0.8*y,4,4 adaptive 0 jitter
  rotate 70*x
  rotate 30*y
}
 
light_source{
  <0,0,-23>
  rgb<1,0.9,0.7>*2.5
  area_light 4*x,4*y,4,4 adaptive 0 jitter
  rotate 10*x
  rotate -80*y
}

light_source{
  <0,0,-23>
  rgb<0.5,0.7,1>*0.5
  area_light 4*x,4*y,4,4 adaptive 0 jitter
  rotate 60*x
  rotate -30*y
}


_____________
Kari Kivisalo

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