"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:39025122$1@news.povray.org...
| In article <39023756@news.povray.org> , "Steve Tucker" <stu### [at] lobonet>
| wrote:
|
| > Any ideas on how to extract all the visible portions of a rendering that are
| > within a range of distances from the camera?
|
| CSG?

If so, how about something like:

#declare DIST=100; // distance within scene to be kept

camera { location LOC look_at LOO }

difference {
union {
 // all of scene within here
}
sphere {LOC, DIST inverse}
}

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