In article <3ee7479b$1@news.povray.org>,
 Lutz-Peter Hooge <lpv### [at] gmxde> wrote:

> I don't think so. It would be correct for a reflection on a plane, but 
> totally wrong for a reflection on a small sphere.
> To make it correct the 'width' of the ray would be needed, and to 
> calculate (an approximation of) this, the curvature of the reflective/
> refractive surface at the intersection point would be needed.

You need to track the ray footprint, it's called differential ray 
tracing. If I remember right, Ron Parker was talking about this a few 
years ago, but never got it added to POV.

http://graphics.stanford.edu/papers/trd/

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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