Ron Parker <par### [at] my-dejanewscom> wrote:
: You neglect reflected and shadow rays, but other than that this explanation 
: seems reasonably correct.  As a result, you could use this effect to create 
: a "vampire object" with no reflection and no shadow (bound it with a small
: sphere around the camera), or an invisible object that casts a shadow (bound
: it with a small sphere around the light source.)  Don't forget the -UR on 
: the command line.

  I have never thought about that. It's even more interesting.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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