Just to add my 2c, I find the easiest way to deal with this is to add a sky 
sphere that radiates light - map an image (ideally HDR) onto it

This then simulates realistic lighting of objects and gives you the proper 
shadow effect

An example can be seen in a short animation I did here: 
http://www.soware.co.uk/POVRay/player.php?id=6
or the original by Paul Debevec here: 
http://www.youtube.com/watch?v=EHBgkeXH9lU
and a very good example similar to PD's but with better shadows here: 
http://www.youtube.com/watch?v=sDAYBG6L8HY

Hope this helped

Regards,

Simon

"arblick spule" <aspule> wrote in message 
news:web.4b2c2ac027e91db9b5d84fdc0@news.povray.org...
>
>>
>>
>> Original render:
>>     http://i53.photobucket.com/albums/g69/aspule/BoxesNoOcc.jpg
>>
>> Ambient occlusion pass:
>>     http://i53.photobucket.com/albums/g69/aspule/BoxesOccPass.jpg
>>
>> Final image:
>>     http://i53.photobucket.com/albums/g69/aspule/BoxesOcc.jpg
>>
>> This is where my method falls down!  Look at the shadows around the base 
>> of the
>> closest box.  Not very good!  This could be corrected by rotating the 
>> average
>> angle towards the real light source, I guess...
>>
>> .....Hey ho...              ...Peace out!
>
> Oh, actually, that shadow would be there if there was sky light going on. 
> All
> that would be needed would be to make the black "sky sphere" white and it 
> would
> all look okay!  Oh how fickle art is.
>
>

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