Hello!

I have modeled a rectangular frame from a sphere_sweep, and put a light
inside the right part of the top cylinder. But in the rendered image the
left part of the cylinder is more lit than the right part. There is only
a small light spot at the light source. I do not know if it really would
look like that or is it some artefact?

Here is the resulting image: http://www.iitis.gliwice.pl/~arataj/a.tga

Here is the POV file:

#include "colors.inc"
#include "shapes.inc"
#include "textures.inc"

global_settings {
  assumed_gamma 2.2
  max_trace_level 7

  photons {
     count 150000
     max_trace_level 7
     adc_bailout 0.1
     media 150
     radius ,1.5
   }

}

camera {
   orthographic
   location <0.2, 2.5, -0.15>
   up  <0, 0.75, 0>
   right <1, 0, 0>
   look_at <0.2, 0.0, -0.15>
}

   sphere_sweep {
     linear_spline
     5,
     <-1, 0.5,  0.5>, 0.2
     < 1, 0.5,  0.5>, 0.2
     < 1, 0.5, -0.5>, 0.2
     <-1, 0.5, -0.5>, 0.2
     <-1, 0.5,  0.5>, 0.2
     scale <0.2, 1.0, 0.2>
     translate <0, 0.3, 0>

      translate <0.0, 0.5, -0.0>
      pigment { color <0.95, 0.95, 0.95> filter 0.95 }
      hollow on

      interior{
         ior 1.45
         media {
           scattering {
              1, rgb <0.1, 0.2, 0.3>
           }
         }
      }
      finish {
         ambient 0.2
         diffuse 0.02
         reflection 0.4
         specular 1.0
         roughness 0.0001
      }
      photons {
         target
         refraction on
         reflection on
         collect on
       }
   }

light_source {
     < 0.5, 0.5,  0.5>
     colour red 0.5 green 0.5 blue 0.5
     scale <0.2, 1.0, 0.2>
     translate <0, 0.3, 0>
     translate <0.0, 0.5, -0.0>
}

Cheers,
Artur

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