ingo <ing### [at] tagpovrayorg> wrote:
> Just have your lenssystem project the photons on a "film"-plane and use 
> the camera to render an image of that projection.

  Photons do not reflect diffusely from objects and thus what you suggest
is not possible.

-- 
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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