Christoph Hormann <chr### [at] gmxde> wrote:
> No, pretrace does not speed up the render, on the contrary it nearly
> always slows it down.  Its purpose is to achieve a better distribution of
> the radiosity samples taken.

  You are actually contradicting yourself.

  Why do you want a better distribution of samples? Because that way you
get a better result with fewer samples, that is, a faster rendering.
  Without the pretrace step you need a lot more samples to get a good result,
thus resulting in a slower rendering.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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