Quote - I see now what you want, the alpha map itself for Bryce or any other 3d program. The above explanation is exactly how I would do it. I wasn't sure at what you were trying to achieve, but I use fivecat's method all the time for alpha maps.

  Schurby

Yes, probably my fault, as I can get a bit involved when trying to explain what I'm trying to achieve, especially when you aren't sure if you actually need what you think you do to get to the end point.

I think I have a problem with this simply because when I used the save selection method (without adjusting the selection first) I found that I had a nasty ghostly gap between selections and that worried me:

See image:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This shows the difference between the selection of the holes and the selection of the inverse of the holes (I flooded both with black to show the gap between the two selections - not very accurate I thought, looked like some sort of feathering of the selection I thought, so I was trying to solve that with the expanding of the selections so as to close that gap between the two.

Is there some way to turn feathering off on selections?  Maybe if there is, that would help?

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