> Hi,i made this simple scene: a red light source through a projector(a small
> prism) , a large box to define an interior and a media, and finally a mirror
> (define by points of spline) and a cylinder for test the reflection. I have also
> 2 camera, by the ortographic camera, as you can see rendering the scene, are
> visible the correct rays of light of a source light (thanks to interior inside
> box) but i don't understand why i dont' see the rays of light reflected by the
> mirror. While if i active the 'camera behind' you can see that the photons
> reflected on a cylinder correctly!
> How can i do to show the rays of light reflected by the mirror like the rays
> that hits the mirror?
> I posted a code of scene.
>
> #include "colors.inc"
> #include "textures.inc"
> #include "shapes.inc"
> #include "metals.inc"
> #include "glass.inc"
> #include "woods.inc"
> #include "stones.inc"
>
>
>
>
> //
> global_settings {
>      assumed_gamma 1
>      max_trace_level 15
>      photons {
>          spacing 0.000025
>          count 1800000
Use spacing OR count, never both.
>          max_trace_level 15
           media 1,2
Without this, there are no photons deposited in the media. Adjust the 
values as needed.
>
>      }
> }
>
> // ortographic camera
> camera {
> orthographic
> location<00.0, 110.0,30.0>
> look_at<0.0, 0.0, 30.0>
>
>         }
> // camera behind
> /*camera {
> location<15.0, 50.0,70.0>
> look_at<15.0, 10.0, 40.0>
> blur_samples 50
>
>         }   */
>
> declare a= 1;
> declare b=0.61;
> declare Projector = prism   {
>            linear_spline
>             5, 5.004, 4,
>            <0,0>,<-a,b>,<a,b>,<0,0>
>           pigment {Yellow}
>
>          }
> Projector
Not needed unless you want the projector to be visible.
A beter instanciation would be:
object{ Projector pigment {Yellow} }
and remove the pigment from the declaration.
>
> light_source{<0,5.002,-0.1>
>
>          color Red  *200
>          photons {refraction on reflection on}
>
>          projected_through { Projector }
>
>   } //end of light_source
>
>   //box for interior
> box {
>          <-67, 0, -10>, //
>          <  67, 10, 60>  //
>          hollow
>         texture {pigment {color rgbf 1}}
>         //texture {pigment {Blue}}
>
>         interior {
>          media {
>              scattering {1, color White extinction 0}
> //            emission color White*0.2
>              method 3
>              intervals 1 samples 4
>          }
>          }
>          //photons {target}
photons{pass_through}
>      }

This box need hollow. As it is now, it can't contain the media.
You may need more samples, possibly something like 100...
Remove intervals, you don't need it to set it with the default value 
that should not be changed.
photons{pass_through} is needed so that the photons actualy reatch your 
mirror.

>
>
> // cylinder for test reflection
>    cylinder {
> <0, 0, 30>, //
> <0, 30, 30>, //
> 14.0 // raggio
> //open //
> //texture { P_Silver1 }
> pigment{White}
> //photons {target}
>
>
> }
>
>
>
>   #declare mirror =
>    union {
>
>      prism {
>        cubic_spline
>    2,
>   8,
>      56,
>        <-48.500000, 40.500000>,
>        <-48.500000, 40.500000>,
>        <-46.956445, 41.531168>,
>        <-45.574971, 42.461886>,
>        <-44.333273, 43.305708>,
>        <-43.212883, 44.073862>,
>        <-42.198386, 44.775732>,
>        <-41.276812, 45.419218>,
>        <-40.440374, 46.008760>,
>        <-39.675929, 46.552711>,
>        <-38.975541, 47.055922>,
>        <-38.332364, 47.522584>,
>        <-37.740461, 47.956339>,
>        <-37.194656, 48.360364>,
>        <-36.692357, 48.735995>,
>        <-36.227347, 49.087338>,
>        <-35.796160, 49.416532>,
>        <-35.395729, 49.725477>,
>        <-35.023326, 50.015864>,
>        <-34.676523, 50.289204>,
>        <-34.354393, 50.545856>,
>        <-34.053565, 50.788154>,
>        <-33.772312, 51.017183>,
>        <-33.509077, 51.233921>,
>        <-33.262452, 51.439254>,
>        <-33.031164, 51.633989>,
>        <-32.814897, 51.818141>,
>        <-32.611649, 51.993177>,
>        <-32.420477, 52.159700>,
>        <-32.240518, 52.318264>,
>        <-32.070983, 52.469375>,
>        <-31.911149, 52.613501>,
>        <-31.760940, 52.750536>,
>        <-31.619089, 52.881467>,
>        <-31.485045, 53.006654>,
>        <-31.358299, 53.126432>,
>        <-31.238379, 53.241112>,
>        <-31.124852, 53.350982>,
>        <-31.017735, 53.455897>,
>        <-30.916190, 53.556557>,
>        <-30.819875, 53.653190>,
>        <-30.728477, 53.746009>,
>        <-30.641700, 53.835213>,
>        <-30.559273, 53.920990>,
>        <-30.481245, 54.003190>,
>        <-30.407043, 54.082329>,
>        <-30.336448, 54.158556>,
>        <-30.269257, 54.232014>,
>        <-30.205279, 54.302836>,
>        <-30.144337, 54.371148>,
>        <-30.086491, 54.436809>,
>        <-30.031336, 54.500210>,
>        <-29.978726, 54.561454>,
>        <-29.928528, 54.620638>,
>        <-48.500000, 40.500000>,
>        <-29.928528, 54.620638>
>      }
>
>      //pigment {color rgb<  0, 1, 1>  filter 1}
>      //finish {ambient 0 diffuse 0 reflection Blue conserve_energy}
>
>      texture {Chrome_Metal}
>      finish { reflection 1  metallic 1.0 diffuse 0 conserve_energy}
You don't need conserve_energy for a perfect mirror with no transparency 
at all.
>
>      photons {
>    target
>    reflection on
>    refraction off
>
>   }
>      }
>      mirror
>
>
>
>
>

Alain

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