Alain <aze### [at] qwertyorg> wrote:

> > 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

Ok! It works, I rewrote a code by providing your suggestions. There is one thing
that I did not understand: since i want to differentiate rays of light direct to
mirror and rays of light reflected by the mirror i put in a source light :
'color White' and in the final part of code of mirror i put:

pigment {color rgb < 0, 1, 1> filter 1}
finish {ambient 0 diffuse 0 reflection Red }

(as you can see in the code that i posted) . In this case the risulting of
reflection is better than if i use a first solution: that is the color red on a
source light and :
texture {Chrome_Metal}
finish { reflection 1  metallic 1.0 diffuse 0 }. If you render the two different
solution you can note the difference of reflection in the terminal part of
mirror.

This is the code . I added another simmetric mirror.

#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
        max_trace_level 15
        media 30,2

    }
}

// 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

       }   */


//camera3
//vista relativa alla camera 3
/*camera {
location <-33.0, 47.0,33.0>
look_at <0.0, 0.0, 30.0>

       }    */

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

light_source{ <0,5.002,-0.1>


        //color Red  *200
        color White
        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
             samples 10
        }
        }
        photons{pass_through}
        //photons {target}
    }


// cylinder for test reflection
  cylinder {
<0, 0, 30>, //
<0, 30, 30>, //
14.0 // raggio
//open //
//texture { P_Silver1 }
pigment{White}
//photons {target}
no_reflection

}



 #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>
    }

    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>
    }


    // if i want reflection red
    pigment {color rgb < 0, 1, 1> filter 1}
    finish {ambient 0 diffuse 0 reflection Red conserve_energy}

    // with this the reflection is not good as above
    //texture {Chrome_Metal}
    //finish { reflection 1  metallic 1.0 diffuse 0 }

    photons {
  target
  reflection on
  refraction off

 }
    }
    mirror

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