> background essentially doesn't exist, I guess you could say. It's not a
> object so maybe that's the logic. So the obvious: putting a backdrop plane
> is a possible workaround. Use pigment {rgbt 0.5}, rgbf includes the color
> value in the transparency and so isn't reliable for exact percentage.
You'll
> also need to set finish {ambient 0 diffuse 0} to prevent any color
intensity
> shifts due to light sources shining onto it.

Now, that doesn't work either.  It just turns out dark grey... but I finally
got the effect I wanted by cutting it into pieces in photoshop and setting
opacity on the layers.

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