Consider the following scene code:

//start code
#version 3.7;

#include "colors.inc"

global_settings {assumed_gamma 1.0}

camera {
   location  <0, 5, -40>
   sky       y
   up        y
   direction z*1.7
   right     x*image_width/image_height
   angle     70
   look_at   <0, 5, 100>
}

#include "sunpos.inc"
#declare MySun  = SunPos(2012, 3, 5, 13, 10, 0, 31.7625, 25.0888);
#declare EXP = 8e-5;

// SkySim
#include "SkySim.inc"
SkySim( SolarPosition,
      y,
      5,
      EXP
    )

#declare SunColor = rgb 1;

light_source {
   MySun
   color    SunColor*(17334 * EXP)
   //parallel
   //point_at <0, 5, 100>
}


plane {y, -5 pigment {rgb 1}}
cylinder {<0,-5,10>, <0,6,10>, 1 pigment {rgb <1,0,0>}}

//end code

It renders well (see image: SkySim_SolarPosition) also with parallel and 
point_at in the light_source uncommented.

Now, switch SolarPosition in the SkySim macro call, by MySun. I get 
image SkySim_MySun.

Now, uncomment parrale and point_at in the light_source. I get image 
SkySim_MySun parallel.

So, what is wrong here? All goes well in the original test scene.

Thomas

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Attachments:
Download 'skysim_solarposition.png' (15 KB) Download 'skysim_mysun.png' (24 KB) Download 'skysim_mysun parallel.png' (15 KB)

Preview of image 'skysim_solarposition.png'

Preview of image 'skysim_mysun.png'

Preview of image 'skysim_mysun parallel.png'