Hi all

I am trying to draw a 'gyroid' structure in POVRAY, but have no idea where to
start.

I have found, from a source on the internet, that the function for the surfaces
is as follows, but I'm not sure how to fit this into a POVRAY code:

v(x,y,z) = sin 2x cos y sin z + sin 2y cos z sin x + sin 2z cos x sin y - 0.15
(cos 2x cos 2y + cos 2y cos 2z + cos 2x)

A gyroid structure looks like this picture:

http://www.nada.kth.se/~asa/bilder/gyroid1.png

Many thanks

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