I've been using povray for a couple of weeks now. I've got
two questions which have been bedeviling me.

1) Is it possible to set up rendering so that the resulting png has a
transparent background?  I've tried both

background { rgbt <0,0,0,1> }

and

background { rgbt <1,1,1,1> }

but when I look at the result in the Gimp, the background seems to be
black or white respectively.  I've googled and searched these fora but I
can't seem to find the answer.

2) I'm modelling a Mercury spacecraft, which I want to put in low-earth
orbit, and I'm having problems with the lighting. The light sources
would be the Sun and the Earth. I've tried a parallel light source for
the sun, and a large white sphere out of view for the Earth.  I didn't
seem to be getting much if any "earthshine" this way, so right now I'm
using a large area light, but I'm still not happy with the results, is
there a better way to set up this lighting scene?

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