"Christoph Hormann" <chr### [at] gmxde> wrote...
>
> You might have a look at the material_map section in the pov docu,
> furthermore you can also specify a transmit value for the different color
> indices in an indexed image_map.

Alternatavely, with MegaPov you can use an image_pattern to create a pattern
and then use your texture and a clear texture for the two entries.  For
example, you could use something like this (syntax may be a bit off):
texture{
  image_pattern{ png "img.png" }
  texture_map{
    [0 pigment{rgbt 1}]
    [1 MyTexture]
  }
}

Black parts of img.png will turn out clear, white parts will show MyTexture,
and anything in between will have a blend of the two.

-Nathan

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