Felix Wiemann wrote:

> marabou wrote:
> 
>> i have tried it now with six planes and one plane made hollow. but then
>> fog is gone. why that?
> 
> Could you post an example scene? Where are those six planes?

here they are.

//------------------------------code starts

#include "colors.inc"

// POV3.1

global_settings{
        ambient_light 2
        radiosity{
                gray_threshold 0.3
        }
}

//--wish arealights? jitter? diffuse? turn it on!
#declare AreaOn = 1;
#declare Foggy = 1;
#declare goSpot = 0;    //spotlight?

//------------------------------------------------------------------------->>>macros

//-------------------------------------------------------------------------<<<macros

camera{ location <0,1.7,-2.8> look_at <0,1.5,0>}


#if (!goSpot)
light_source{
        <-1,2,-1> color <1,0.92,0.43>
        #if (AreaOn)
                area_light <-2,0,-2>,<2,0,2>,4,4
                adaptive 1
                jitter
        #end    
}
#end

plane{
        y,0
        pigment{
                color <50,80,108>/255
        }
}
plane{
        y,3
        pigment{
                color White
        }
}

plane{
        z,2
        pigment{
                color White*2
        }
}

plane{
        z,-4
        pigment{
                color White
        }
}

plane{
        x,-2
        pigment{
                color <255,204,109>/255
        }
}
plane{
        x,2
        pigment{
                color <109,179,255>/255
        }
}

#if (Foggy)
fog{
        distance 3
        color <255,246,186>/255
        fog_type 2
        fog_offset 1
        fog_alt 0.2
        turbulence 0.6
        turb_depth 0.2
}
#end


//------------------------------code ends

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