/*
  Spot Light Test
  by Rafał 'Raf256' Maj (C) 2002 pov@raf256.com
  1:1
  started 20.07.2002, last ver 0.05 20.07.2002 for 3.5win
*/

camera { location <0,15,-5> look_at <0,0,0>  angle 15 }
background { color rgb <.3,.3,1> }

#declare _rad    = 1.0; // <-- configuration
#declare _dist   = 5.0;

cylinder {
  <0,-1,0>, <0,0.10,0>,
  _rad
  pigment { color rgb <.7,1.0,.7> } finish { ambient .4 }
}
light_source { <40,160,-100>*1e3 color rgb .4 } // ambient

light_source { // SPOT
  <0,_dist,0> color rgb 1
  spotlight  point_at <0,0,0>
  #declare _f = sin(_rad/_dist)*57;
  radius  _f
  falloff _f
  tightness 1
}

plane {
  y,0 pigment { checker color rgb <.5,.5,1> color rgb <1,.5,1>}
}