This is just an idea, but perhaps if the object being rendered was given
a white ambient finish and rendered with a black background with AA on,
this would make a good alpha channel for the color render. I haven't
tried it before though.

-Mike

Nathan Kopp wrote:
> 
> Here's the solution that I use:  I render the image at much higher resolution
> than I intend to use, with antialiasing turned OFF.  Then I open it in a paint
> program that handles transparancy (I use Paint Shop Pro 5).  Next, I remove the
> background color, then resize the image down to the size I want.  PSP does a
> good job resampling, so you get the effect of antialiasing but the edges
> antialias to the alpha channel instead of to black.
> 
> -Nathan

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