On Tue, 23 Jul 2002 22:21:30 -0500, Ed Jackson <eja### [at] iastateedu>
wrote:

>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.

Don't quote me on this, but I think the reason the focal point is not
a scalar is that thus the restriction of having it on the focal axis
is avoided. There are sometimes situations when you need this. I've
seen photos with their focal point way off the center - of course,
they were cropped off bigger photos to achieve the effect, but if you
want to do that in POV and have to render an image where you'll only
use 25% of it, it won't make much sense.

I guess that answers your questions.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG      e-mail : pet### [at] tagpovrayorg

Post a reply to this message