Bob Hughes wrote:
> 
> Is this not similar to 'rgbft' as it is already? (sorry, I had to ask
> that :)

This would give a bit more flexibility, since you could, for example, have
a bozo color pattern (pigment) but use a gradient for the transparancy.  As
I mentioned before, this could be done with a pigment_map.

The main strength is that this allows more possibilities in terms of other
ways of combining color.  Paint programs (like Photoshop or PSP) provide
many ways of combining layers together.  It would not be too difficult to
provide those same features here in POV.

> You're last example apparently needs the 0 replaced with a 1 (am I
> right?)
> 
> >   At Transparence_Value = 0, you get    // = 1  instead?
> >     w1[] = 1,  w2[] = 1.0,
> >     therefore ResultColour[] = pigment_Colour[]*Colour_Behind_Object[];

You're correct.  That is what I meant to type.

-Natahn

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