POV-Ray : Newsgroups : povray.advanced-users : Something wrong with the scattering~ Server Time
26 Dec 2024 01:41:01 EST (-0500)
  Something wrong with the scattering~ (Message 1 to 1 of 1)  
From: Ziyan
Subject: Something wrong with the scattering~
Date: 29 Jun 2005 18:05:03
Message: <web.42c31aa86fac54932ad910ed0@news.povray.org>
Last time someone helped me with this programme, in which you can see the
reflection and the light through object MA and MB. Now in my model I don't
want the light goes through MB, and man can just see the reflection and
light in MA, how could I do with that? When I delete the object MB or set
the rgbt with <*,*,*,0>, there's even no light going through MA. I don't
know what's wrong with that, could anyone here help me? MB shouldn't be
deleted but no light should be seen in it.

/////////////////////////////global_settings////////////////////////////////////
global_settings {
                 //assumed_gamma 1.9
                 max_trace_level 10
                 photons {
                          adc_bailout       0.01
                          spacing           0.1
                          gather            20, 100
                          media             1, 1
                          jitter            0.4
                          max_trace_level   5
                          autostop          0.5
                          radius            0.0
                          expand_thresholds 0.2, 35.0
                          }
                 }
/////////////////////////////camera////////////////////////////////////////////
camera {
         location <0,0.5,-66>
         angle 120
         up 1*y
         right 1.333*x
         look_at <0,0.5,-65>
         translate <-27.5,0,0>
         }

background { color rgb <0, 0, 0> }
/////////////////////////////scattering///////////////////////////////////////
#declare Scattering =
   material
   {
      texture
      {
         pigment
         {
            color rgbt <0.531233, 0.531233, 0.531233, 1.0>
         }
      }
      interior
      {
         media
         {
            variance 1.0/128.205128
            scattering
            {
               1 ,  rgb <0.03, 0.03, 0.03>
               extinction 0.25
            }
         }
      }
   }

#declare Scattering_1 =       //Material mit Brechungsindex 1.55
   material
   {
      texture
      {
         pigment
         {
            color rgbt <0.0, 0.0, 0.0, 1.0>
         }
         finish {
                 reflection {0.1,0.9 fresnel}
                 }
      }
      interior
      {
         ior 1.55
         media
         {
            variance 1.0/128
            scattering
            {
               1 ,  rgb <0.5, 0.5, 0.5>
               extinction 0.5
            }
         }
      }
   }


#declare Scattering_2 =                 //Material mit Brechungsindex 1.438
   material
   {
      texture
      {
         pigment
         {
            color rgbt <0.0, 0.0, 0.0, 1.0>
         }
         finish {
                 reflection {0.1,0.9 fresnel}
                 }
      }
      interior
      {
         ior 1.438
         media
         {
            variance 1.0/128
            scattering
            {
               1 ,  rgb <0.5, 0.5, 0.5>
               extinction 0.5
            }
         }
      }
   }
///////////////////////////////lights///////////////////////////////////////
/*light_source {
              <0.0, 0.0, 0.0>
              color rgb <1.000, 1.000, 1.000>
              media_interaction off
              photons {
                       reflection off
                       refraction off
                       }
              translate  <0, 5, -60>
              }*/

light_source {<0, 0.5, 80>
              color rgbt <10,0,0>
              spotlight             //spotlight
              falloff 0.5
              radius 0.2
              tightness  0.000
              point_at <0,0.5,65>
              photons {refraction on reflection on}
              media_attenuation on
              translate <-27.5,-0.25,0>
              }

box{
    <-5,-5,-80>, < 5, 5, 80>
    material {
              Scattering
              }
    hollow
    translate -27.5*x
    photons {
             target 1
             reflection on
             refraction on
             collect on
             }
    }
////////////////////////////////plane/////////////////////////////////////////
#declare Checkered_1 =
   material
   {
      texture
      {
         pigment
         {
            checker
               color rgb <0.882353, 0.882353, 0.882353>
               color rgb <0.952941, 0.952941, 0.952941>

         }
         scale  0.2
      }
   }

plane {
       z,-79
       material {
                 Checkered_1
                 }
       photons {
                target 1
                collect off
                }
       }

//////////////////////////////Objects/////////////////////////////////////////

#declare Blatt = merge {box{
                            <-37.5,1,65>,<37.5,-1,-65>
                            pigment {colour <0.3,0.3,0.3>}
                            photons {
                                     target 1
                                     reflection on
                                     }
                            }
                        box{
                            <-37.5,1,10>,<37.5,-1,-10>
                            rotate 90*x
                            translate 11*y
                            pigment {colour <0.3,0.3,0.3>}
                            photons {
                                     target 1
                                     reflection on
                                     }
                            }

                        }


#declare Nuten1 = box{
                      <-0.51,0.51,66>,<0.51,-0.51,-66>
                      translate <-27.5,0.5,0.0>
                      pigment {colour <0.3,0.3,0.3>}
                      photons {
                               target 1
                               reflection on
                               }
                      }

////////////////////////////////////////////////////////////////////////////////

object {
        difference {
                    object{Blatt}
                    object {Nuten1}
                    }
        }

#declare MA = merge {object {cylinder {-65*z,65*z,0.4}
                             }
                     object {box {<-0.4,-0.25,-65>,<0.4,0.25,65>}
                             translate 0.25*y}
                             }

#declare MB = difference {box {<-0.5,-0.5,-65>,<0.5,0.5,65>}
                          object {MA  scale 0.999}}

object { MA
         translate <-27.5,0.5,0>
         material {
                   Scattering_1
                   }
         hollow
         photons {
                  target 1
                  reflection on
                  refraction on
                  collect on
                  }
        }

object { MB
         translate <-27.5,0.5,0>
         material {
                   Scattering_2
                   }
         hollow
         photons {
                  target 1
                  reflection on
                  refraction on
                  collect on
                  }
        }


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