"Kenneth" <kdw### [at] gmailcom> wrote:

>
> Using your 'scale 2' camera, what it looks like is that the focal_blur's
> focal_point of <0,0,0> (the focal 'plane')is actually shifting to <0,0,-5>. In
> other words, it's keeping the same original 5-unit distance from the CAMERA--
> not scaling to 2*5 = 10-units. That's what I see from a simple test, anyway.

.... and changing the focal_point to <0,0,5> does indeed bring the focal plane
back to the original <0,0,0>.

Although, for a camera position that's not just <0,0,0> but something like
<3,13,-9>, it appears that the interplay between scaled camera and 'new' focal
plane gets much more complicated.

But I tried something weird, which seems to work(!) ...

The initial simple test:
original camera position: <0,0,-5>
original focal_point: <0,0,0>

With scale 2:
new camera position: <0,0,-10>
new focal_point set to: <0,0,5>

Now, with a more complicated camera position:
original camera position: <3,13,-9>
original focal point: <0,0,0>

With scale 2:
new camera position: <...? ...> (I'm too lazy to figure it out)
new focal_point set to: <-13,-3,9>

That appears to bring the original 'focal plane' of <0,0,0> back into sharp
focus! (Although, that plane is always perpendicular or orthogonal(?) to the
camera view.) The math for the new focal_point looks to be quite simple as well.

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