Quote - > Quote - and in the link you posted the ceiling does appear to be visible at the top corners of the photo.

Which link is that? The only link I see above in my posts is:

http://en.wikipedia.org/wiki/Cornell_box

That wiki article does not have a photo - it has a render from POV-ray and I don't see any ceiling, so you must be talking about something else.

 

Oops; sorry Ted, it was Honzu's link...

http://www.graphics.cornell.edu/online/box/compare.html

----------------------------------------------------------------------------------------

The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
bagginsbill's Free Stuff... https://web.archive.org/web/20201010171535/https://sites.google.com/site/bagginsbill/Home