"Kima" <nomail@nomail> wrote:

> Thanks for the links. I played with the codes to find a way, and finally ended
> up using 'wrap'. Everything seems to work perfectly, but I do not fully
> understand where the Object Pattern is fitted on the object. I should ask
> another question for this :)

In order to understand how patterns work, you need to think in terms of "how
does POV-Ray evaluate what to do with a pixel that represents <x, y, z> in 3D
space.

So when you define a object pattern, you define a 3-dimensional mask, just as if
you had a scene in it with nothing but your transparent object in a big white
empty space.  Now take out a can of spray paint and press down the nozzle.  If
the paint hits your object - right where the bounding box says it is - then it
gets painted.

So the object pattern is sort of set up as pattern (object_paint,
emptySpace_paint)

Maybe that way of thinking about it helps.

If it's still unclear, you can always show your object in the scene with a
regular pigment, maybe with some transparency or filter.  This is useful for
when things like difference {} get confusing.

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