Among other things, Slime saw fit to write:

> But version 3.5 didn't have this problem, so if you're not depending on
> any of the changes in version 3.6, then you can use version 3.5 for your
> alpha-output images.

If the alpha channel is OK, you could render twice (once with +ua and once
without) and use the alpha channel of the "transparent" picture for the
"opaque" one.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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