Hi,
I have a cylinder in <0,0,0> with radius _rad and a spot light at
<0,_dist,0> pointing at 0. What should be radius (and falloff) to make 
light shine exacly and only on my cylinder (on it's top side) and not on 
sorrounding ?

I thought that this would be 90*sin(_rad/_dist) but following example (full 
posted to p.b.s-f) shows that it is 57*sin(_rad/_dist)
Why 57.0 ? This number probalby deepends on tightness, what's formula for 
it ?

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
}


-- 

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> kolejny atak na centrale TPSA
- Expert vel Jacek (obecnie gol### [at] pocztaonetpl)

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