On 10/12/2010 09:27, Bidski wrote:
> The picture is made by using a mesh of 48 triangles, all with the same texture
> and the mesh itself has an interior specifying the IoR and a couple of other
> flags.
>

I did a similar cut with csg a long time ago:
(it's a 3.1 object)

http://jgrimbert.free.fr/pov/brilliant.zip

(preview here:
http://jgrimbert.free.fr/pov/objet.html
)

(object is inside a sphere of radius 1, <0,0,0> is the center of the 
greatest circle)

CSG is simpler than mesh when you need an interior.

You need an environment to reflect, and raise the trace level (really 
raise it, 5 is far from enough with such gem's cut)

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