the FAQ at tag.povray.org says this in comparing MegaPOV postprocess focal
blur with POV's internal focal blur:

"For example, think that you have a red box in front of a green box so that
one of their edges coincide in the final image (the green box is located
behind the red box so that it's not seen in the image, but if you moved the
camera just a bit in the right direction the edge of the green box would
become visible). Now use focal blur so that the focal point is at the edge
of the green box: Part of the green box appears from behind the blurred red
box!
This is not possible with the post-process focal blur. "

Is this based on a real world physical model? i'm no photographer, but this
sounds counter-intuitive to real vision (atleast with a single lense?
atleast my intuition?). i tried searching the news groups for things like
"focal blur physical model" and several variations, but nothing popped out
at me.

Post a reply to this message