Mick Hazelgrove wrote:
> 
> Here's how I make tgas with a partially transparent background.

Consider this. You have image with one transparent layer only. Paint
on it with airbrush. Now try to apply the layer as texture so that
the effect is same as if you airbrushed directly on the texture layer
below. Not so easy.

Here is a pictorial presentation of the problem. The bg color green
could have been _any_ color and it would still show up on the render.
The checker pattern that shows through transparent layers is duplicated
as the bg layer in povray.
http://www.pp.htv.fi/kkivisal/layer.jpg


_____________
Kari Kivisalo

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