[This followup was posted to povray.binaries.images and a copy was sent 
to the cited author.]

In article <chrishuff-7CBC3C.17374621012001@news.povray.org>, 
chr### [at] maccom says...
> In the first image, the portal is the sphere in the middle...the "far 
> end" of the portal is just a larger sphere surrounding the scene.
> The second image is a small, closed room with a portal to an open area. 
> The room is lit entirely by light from the portal. As you see, no direct 
> light can pass through the portal...one of the limitations of my patch.
> 

Could you please explain to a mere mortal person what is shown in your 
'portal' images?? 
What is a portal? 
I have the feeling I miss something important here :)
-- 
Regards,  Sander

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