In article <863### [at] duchesstwilleyorg>,
 Jack Twilley <jmt+use### [at] twilleyorg> wrote:

> I expected to get a rainbow pattern on the target, but instead the
> light passes directly through the prism without refracting or
> reflecting in any noticeable way.

Hmm...I see a rainbow. Even in the image you gave. Do you expect it to 
be spread out more?
First, your dispersion_samples is quite high, and your photon count a 
bit low. I dropped dispersion_samples to 20, and raised photon count to 
5000000, the result was a clearer looking rainbow spot. Second, 1.2 is a 
pretty low ior for glass, I replaced it with 1.4, and raised dispersion 
to 1.06 and the light source brightness to 5 in order to exaggerate the 
effect.

BTW, the maximum max_trace_level is 256, 20000 is a little high.


> The "+A +AM2 +R7 +J" don't seem to really matter, though, because I
> get effectively the same results without the added settings, and it
> takes seven seconds instead of thirteen minutes on my machine.

It will make no difference as far as dispersion is concerned. As for the 
speed...you could probably get a big improvement in speed by lowering 
the recursion level. 7 is quite deep for this, lower recursions can 
usually give good results with much less of an impact on speed.

-- 
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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