Hi all,
I'm a newbie.. I've two problems with this file:
1) there is no media scattering on the central beam (that collimated by the
reflector) while there is scattering on the direct radiation. How to obtain
light scattering from the central beam?
2) The central beam is not uniform, but it appears so: the spot is saturated.
How to avoid this? How to have a more gradual representation of the
illumination? (note: this happens always, also even when the media scattering is
not present).

Thanks anybody!

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

global_settings
{ photons
  { count 5000
   media 100   //  This parameter has no influence !?
  }
}

#if (1)
        camera { location <-60,30,-150> look_at <50,-20,0> angle 60} // lateral
prospective view
#else
        camera {orthographic location <5,0,0> look_at <50,0,0>}   // frontal
orthographic view
#end

// screen
#declare xpos = 60;
box {
     <xpos, -60, -60>, <xpos+10, 60, 60>
        pigment {rgb <1,1,1>}
        finish {ambient 0.1 reflection 0 diffuse 1}
        photons {target}
}

#declare lampandreflectorxpos = -20;

// lamp
light_source
{ <lampandreflectorxpos, 0, 0>,
  color rgb<1, 1, 1> * .1
  //area_light z,y,4,4
  photons { refraction off reflection on }
}

#if (0) // stop for the direct radiation, placed in front of the lamp
cylinder
{<lampandreflectorxpos+1,0,0>,<lampandreflectorxpos+1.5,0,0>,1.5}
#end

#if (1) // smoke block for scattering
cylinder { <lampandreflectorxpos-3, 0, 0>, <xpos+1, 0, 0>, 60
  pigment { rgbt 1 }
  interior {media {scattering { 1, rgb .05 extinction 0}}}
  hollow
}
#end

// Reflector

// Internal specular surface
lathe {quadratic_spline 61,
<15.0506,26.2944>
<14.9282,25.8564>
<13.7045,21.4767>
<12.6537,18.0146>
<11.7408,15.2308>
<10.9395,12.9592>
<10.23,11.0815>
<9.5966,9.5118>
<9.0272,8.1864>
<8.5122,7.0572>
<8.0436,6.0874>
<7.615,5.2486>
<7.2212,4.5183>
<6.8577,3.8786>
<6.5209,3.3153>
<6.2076,2.8168>
<5.9151,2.3736>
<5.6413,1.978>
<5.384,1.6234>
<5.1417,1.3046>
<4.9128,1.0169>
<4.696,0.7566>
<4.4903,0.52035>
<4.2946,0.30541>
<4.1079,0.10939>
<3.9296,-0.069755>
<3.7589,-0.23381>
<3.5952,-0.38432>
<3.4379,-0.52263>
<3.2864,-0.64992>
<3.1404,-0.76722>
<2.9994,-0.87545>
<2.863,-0.9754>
<2.7309,-1.0678>
<2.6027,-1.1533>
<2.4781,-1.2324>
<2.357,-1.3056>
<2.2389,-1.3734>
<2.1238,-1.4362>
<2.0113,-1.4943>
<1.9014,-1.5481>
<1.7937,-1.5978>
<1.6881,-1.6438>
<1.5845,-1.6862>
<1.4827,-1.7252>
<1.3826,-1.761>
<1.284,-1.7939>
<1.1868,-1.8239>
<1.0908,-1.8513>
<0.99606,-1.876>
<0.90231,-1.8982>
<0.8095,-1.9181>
<0.71751,-1.9356>
<0.62626,-1.951>
<0.53564,-1.9641>
<0.44556,-1.9752>
<0.35592,-1.9842>
<0.26663,-1.9911>
<0.17761,-1.9961>
<0.08876,-1.999>
<0,-2>
  photons { target reflection on collect off }
  finish { reflection 1 ambient 0 diffuse 0 }
  rotate -90*z
  translate <lampandreflectorxpos,0,0>
 }

// External case
lathe {quadratic_spline 61,
<15.0506,26.2944>
<14.9282,25.8564>
<13.7045,21.4767>
<12.6537,18.0146>
<11.7408,15.2308>
<10.9395,12.9592>
<10.23,11.0815>
<9.5966,9.5118>
<9.0272,8.1864>
<8.5122,7.0572>
<8.0436,6.0874>
<7.615,5.2486>
<7.2212,4.5183>
<6.8577,3.8786>
<6.5209,3.3153>
<6.2076,2.8168>
<5.9151,2.3736>
<5.6413,1.978>
<5.384,1.6234>
<5.1417,1.3046>
<4.9128,1.0169>
<4.696,0.7566>
<4.4903,0.52035>
<4.2946,0.30541>
<4.1079,0.10939>
<3.9296,-0.069755>
<3.7589,-0.23381>
<3.5952,-0.38432>
<3.4379,-0.52263>
<3.2864,-0.64992>
<3.1404,-0.76722>
<2.9994,-0.87545>
<2.863,-0.9754>
<2.7309,-1.0678>
<2.6027,-1.1533>
<2.4781,-1.2324>
<2.357,-1.3056>
<2.2389,-1.3734>
<2.1238,-1.4362>
<2.0113,-1.4943>
<1.9014,-1.5481>
<1.7937,-1.5978>
<1.6881,-1.6438>
<1.5845,-1.6862>
<1.4827,-1.7252>
<1.3826,-1.761>
<1.284,-1.7939>
<1.1868,-1.8239>
<1.0908,-1.8513>
<0.99606,-1.876>
<0.90231,-1.8982>
<0.8095,-1.9181>
<0.71751,-1.9356>
<0.62626,-1.951>
<0.53564,-1.9641>
<0.44556,-1.9752>
<0.35592,-1.9842>
<0.26663,-1.9911>
<0.17761,-1.9961>
<0.08876,-1.999>
<0,-2>
  pigment {rgb .5}
  finish { reflection 0 ambient .8 phong 0.5 }
  rotate -90*z
  translate <lampandreflectorxpos,0,0>
  scale 1.05
 }

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