In article <3dbc5044@news.povray.org>,
 "Andrew Coppin" <orp### [at] btinternetcom> wrote:

> I visited the London Science Museum one time... They had this plastic stuff.
> Apparently they make scale models of bridges and stuff out of it to analyse
> stress. Coz, the thing is, when you view it through this clear plastic sheet
> (which probably polarises or something), and when you bend it, the most
> stressed parts show up rainbow colours. (The lightsource might be "special"
> too - it was in a dark room.)

There was probably a polarizing filter over the light source. POV can't 
simulate this effect, but the irid feature might come close to looking 
the same.

-- 
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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