Neat ideas.

You are right I've been using a ground plane. The sphere approach would
probably work even with horizon features such as mountains etc. As there's
no plane there's no cutoff (except objects getting in the way of course).

The multiple light source sounds good but thats going to take some
computation due to the addition of horizon features.

I did think of using a disc placed as a reflector behind the light source?

but I'll give the sphere a go!

I let you know what happens!

David

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