Wasn't it Christopher James Huff who wrote:
>In article <TwEMgAA0$+Z+EwJ### [at] econymdemoncouk>,
> Mike Williams <mik### [at] econymdemoncouk> wrote:
>
>> It's already achievable in POV 3.5. This is a texture I've used for
>> importing transparency maps from Poser. "transmap.jpg" is used to
>> control the transparency and "texture.jpg" is used to control the
>> colour. Obviously, the two image_maps could be replaced by any pattern
>> or function.
>
>This is linearly blending between a transparent texture and a 
>non-transparent one, not quite the same thing.

Well that's all you get if yo have use the alpha channel in the same
image. What extra are you hoping for when the alpha channel is moved to
a different image?

-- 
Mike Williams
Gentleman of Leisure

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