dissolve texture with alpha mask

["Ponthieux, Joey" <j.ponthieux(at)nasa.gov>]

Hello,
   I have a polygon which has a texture mapped on it. The texture has 
an alpha which is used to mask out unwanted areas of the image. All 
unwanted areas should be transparent. I can construct this appearance 
but I am finding that I am unable to fade the positive part of the image 
in and out.

For example, if I had a card, and I textured the letter A on the card, 
only the letter would be visible, everything else on the card would be 
transparent. Then I want to dissolve the letter in and out at will while 
maintaining the base transparency.

I have tried constant shaders, sprite shaders, layers etc. I have 
manipulated mask connections, alpha connections, but still I can find no 
way to accomplish this. Any suggestions would be greatly apreciated.

--
Joey Ponthieux
NCI Information Systems Inc.
NASA Langley Research Center
____________________________________________________________
Opinions stated here-in are strictly those of the author and
do not represent the opinions of NASA or any other party.

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