"Warwick" <nomail@nomail> wrote:
> I'm going to fiddle around and see how far I get - iridescence uses
> light/surface angle, and I believe I should be able to make some progress

So I've had a fiddle, and managed this - no photons involved, very fast
render.

http://www.baverstock.org.uk/tim/images/povdemo5.jpg

Kinda pretty.

Here's most of the hack - the rest is just trivially changing all the
do_irid()
function calls so they supply REye as the third parameter.

http://www.baverstock.org.uk/tim/images/lighting.cpp

Any good? I haven't a clue what the Travel_Diff *1000 scaling factor's
doing - what are POVRay's native units anyway?

I need to work out how to make Track_Field represent CD tracks on a flat
surface - it's currently just a constant vector.

Cheers,

Tim.

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