"alphaQuad" <alp### [at] earthlinknet> schreef in bericht 
news:web.472e20902a06dfe95b922c2d0@news.povray.org...
> "alphaQuad" <alp### [at] earthlinknet> wrote:
>> dont think I got the hang of it yet
>
>
> here's a curiosity: what can POV do?
>
> what about a half moon in the middle of the day?
>

This has been solved very nicely by Bill Pragnell (look for a message  dated 
november 23, 2005, I think in this same ng) and I have used the trick in 
several of my scenes. I took some notes which I reproduce here:

1) use a hollow sphere around your scene (or use inverse) set background to 
black
2) give it the required color gradient you would give a sky_sphere, but use 
a partial transparency, ambient 1, diffuse 0
3) put the moon and the light source (sun) outside of this sphere: the parts 
in shadow will have the same color as the local sky
4) if you want to use radiosity: use an interior_texture on your sphere. The 
ouside texture should be rgb 0, with transmit=1

note 1: you may have to experiment a bit with the transparency and/or the 
gradient colors to get the desired effect.
note 2: instead of a sphere, you can use other objects of course: a plane or 
a cube or whatever.

Hope this helps

Thomas

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