Hello I know this must sound an obvious question but i have taken the optics
demo apart to ray trace a scene which reflects a directional photon beam with a
mirror. The problem is that the beam stops at the mirror. I have tried to set
the max_trace_level to higher numbers and still can't figure out why this
doesn't work.


If somebody can give me a hand i would be grateful. Thanks in advance
Paulo Neves


#version 3.7;

#include "colors.inc"


global_settings {
    max_trace_level 5
    photons {
        count 150000
        max_trace_level 9
        media 500, 2
    }
}

#declare CamPos = < 0, 18, 0>;

camera {
    location CamPos
    look_at < 0, 0, 0>
    angle 35
}

light_source {CamPos, color Gray25
    photons {refraction off reflection off}
    media_interaction on
}
light_source {<-150, 0.5, 0>, color rgb < 1.2, 1, 1.5>
    spotlight radius 0.3 falloff 0.35 point_at < 0, 0.5, 0>
    photons {refraction on reflection on}
}

#macro Block(From, To)
    union {
        cylinder {From, To*(x+z), 0.1 scale < 1, 10*To.y, 1>
            texture {
                pigment {checker color Gray90, color Gray70
                    scale 0.1
                }
                finish {brilliance 0.5}
            }
        }
        cylinder {From, To*(x+z), 0.025
            translate y*To
            texture {
                pigment {color rgb < 1, 0.7, 0.2>}
                finish {ambient 0.8}
            }
        }
    }
#end

box {<-100,-1,-100>, < 100, 0, 100>
    texture {
        pigment {checker color Gray90, color rgb < 0.2, 0, 0.4>}
        finish {brilliance 0.25}
    }
}
box {<-7,-0.1,-3>, < 6, 1, 4> hollow
    texture {pigment {color rgbf 1}}
    interior {
        media {
            scattering {0.5, color White extinction 0}
//            emission color White*0.2
            method 3
            intervals 1 samples 4
        }
    }
    photons {target}
}

union {
    difference {
        object {Block(<-4, 0,-3>, <-4, 1.5, 3>)}
        box {<-5, 0.25,-0.5>, < -3, 0.75, 0.5>}
    }
    cylinder {<-4, 0, 0>, <-4, 1.5, 0>, 0.1 translate z*0.15}
    cylinder {<-4, 0, 0>, <-4, 1.5, 0>, 0.1 translate -z*0.15}
    texture {pigment {color rgb 1}}
}

#declare MirrorTex1 =
texture {
    pigment {color White}
    finish {ambient 0 diffuse 0 reflection 1 ambient 1}
}


#macro PhotonTarget(Reflect, Refract, IgnorePhotons)
 photons {
  target
  reflection Reflect
  refraction Refract
  collect off

 }
#end



#macro Mirror(Pos, Ang, Width, Height, Tex)
 box {<-0.1,-0.1,-Width/2>, < 0, Height, Width/2>
     texture {Tex}
     PhotonTarget(yes, yes, yes)
     rotate -y*Ang
     translate Pos
 }
#end

object {Mirror(<-3, 0, 0>, 3*45, 2, 1, MirrorTex1)}

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