ghonma opened this issue on Jan 14, 2014 ยท 98 posts
bagginsbill posted Tue, 21 January 2014 at 10:18 AM
Quote - But it is in a room
Which by all absence of evidence on the Cornell Box data page, is not contributing to the lighting in a measurable way - one assumes that the room is obscured by a non-reflecting cloth or enclosure.
This page supplies detailed Cornell box simulation data:
http://www.graphics.cornell.edu/online/box/data.html
Nowhere in it is any mention of the factors of the enclosing room - one has to assume that those factors are 0.
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.
If, instead, you're talking about my render of MY version of the box for Poser, it has no ceiling either. The box walls and ceiling, however, are actually thick and have a front face, and also my floor is the Poser ground which extends beyond the box, and the ground shows light spilling out beyond the box, which then reflects back on the front faces of the walls and ceiling. If that's what you're referring to, then it's not a mystery that they're lit - nor are such lit faces present in the official cornell box which by all appearances has nothing whatsoever outside its interior boundary.
Quote - Is there a discussion anywhere online of the environment of the box?
I have not been able to find any, not even in the official Cornell web pages. Given the care and sophistication that goes into their testing and simulation, I very much doubt that you're supposed to think there is any environment contribution at all. Imagine if there was a contribution and they forgot to take it into account - would they not look incredibly stupid?
Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)