Hi all,

From 6.4.3:

"The center of the zone of sharpness is specified by the  focal_point
vector. Objects close to this point are in focus and those farther from
that point are more blurred. The default value is  focal_point<0,0,0>."

This doesn't make sense to me.  Shouldn't you just have to define a
(scalar) distance from the camera for focal blur calculations?  The focal
point would then lie on the direction vector at the specified distance
from the camera.

A related question: If I specify focal_point<0,0,5>  *before* I specify
the location and look_at, do I end up with a focal point five units in
front of the camera?  Or is the focal_point an absolute position?

I hope you'll pardon all the questions; the documentation seems a bit
sparse on this point.

Many thanks,

	-Ed


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