A few questions about focal blur which are not answered in the docs.


1. What is the shape of depth of field (DOF)? Plane? I'd like to suggest 
(in future revisions) a possibility to alter the shape as in real 
lenses. However, I don't know what is the correct mathematical 
representation (paraboloid maybe?).

2. How is this DOF plane aligned? Is there allways a normal in DOF 
plane, that goes through look_at point and location or can it be aligned 
differently so that the normal goes from focal_point to camera location 
and the look_at point is not on this line?

Severi Salminen

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