On 17-4-2012 21:09, Becraft, Robert wrote:
>
> I tried this Thomas... the scenes come out very grainy and dim.  Even moving the
> Alt and Azm around, I couldn't get anything very good out of the render.
>
> The other link to Christoph's textures and such gave me a texture I used here...
>
>

I did not tell but should have mentioned: The code is for the LOTW 
scenes which are oriented with the z-axis *up*!! So this code works for 
those scenes but for the conventional left-handed POV-Ray scenes, you 
have to switch "z" and "y". Also note that in order to keep the Sun 
above the horizon you can either translate the Sun first in the +z 
direction and use Alt as a negative multiplicator to x, or translate 
towards -z and use Alt as a positive multiplicator to x. The reason why 
I have chosen for a negative Alt here is because I also use SunPos.inc 
which translates the Sun towards +z. Here is the relevant code for 
left-handed scenes:

//start code
#declare fn_horizon=function { max(y, 0) }

#declare fn_sun=
   function {
     pattern {
       spherical
       scale 3
       translate z
       rotate -Alt*x
       rotate Azm*y
     }
   }

light_source {
  <0,0,0>
  color SunColor
  translate 10e5*z
  rotate -Alt*x
  rotate Azm*y
}

sphere {
   0, 1
   hollow on
   no_shadow
   pigment { rgbt 1 }
   interior {
     media {
       emission SunColor/1000
       density {
         spherical
         poly_wave 4
         density_map {
           [0.0 rgb 0]
           [0.5 color rgb <0.3, 0.3, 0.3>]
           [1.0 color rgb <1, 1, 1>]
         }
       }
       samples 100 confidence .1
     }
   }
   scale 24000
   translate 10e5*z
   rotate -Alt*x
   rotate Azm*y
}

//end code

Hope this helps

Thomas

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