Frantisek Fuka wrote:

> There are shadows but of course there's no longer any transparency, just
> white ground. And when I try to make the ground see-thru, the shadows
> disappear too... Can I somehow render the shadows but retain the
> background transparency???
>

Hmm... try using a white plane with brilliance 0, something like this:

plane {
  y, 0
  pigment { rgb 1 }
  finish { diffuse 1 brilliance 0 }
}

It should keep the shadows but get rid of the shading, the plane should be 
pure white wherever light hits it.

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