"Ok, great, now that everyone's learned about FOV, focal length, and Xmm lenses, can anyone tell me what FOV *or* focal length blitz's 1x zoom is supposed to simulate."
Well if you take my equation above there...
CameraZoom Camera, 1.0 / Tan(FOV#/2.0)
The important bit:
Zoom = 1.0 / Tan(FOV#/2.0)
We know Blitz' default Zoom is 1.0. So we substitute that into the euqation...
1.0 = 1.0 / Tan(FOV#/2.0)
Then we multiply both sides of the equation by Tan(FOV#/2.0) to simplify it...
Tan(FOV#/2.0) = 1.0
And then we have to get rid of the tan... So we take the arctan of both sides...
arctan(Tan(FOV#/2.0)) = arctan(1.0)
Which ends up being:
FOV#/2.0 = arctan(1.0)
And arctan(1.0) is 45, so...
FOV#/2.0 = 45
And them we multipy both sides by 2.0 to get the result:
FOV# = 90
So there you have it. Blitz's default zoom of 1 is equivalent to a 90 degree FOV.
Well if you take my equation above there...
CameraZoom Camera, 1.0 / Tan(FOV#/2.0)
The important bit:
Zoom = 1.0 / Tan(FOV#/2.0)
We know Blitz' default Zoom is 1.0. So we substitute that into the euqation...
1.0 = 1.0 / Tan(FOV#/2.0)
Then we multiply both sides of the equation by Tan(FOV#/2.0) to simplify it...
Tan(FOV#/2.0) = 1.0
And then we have to get rid of the tan... So we take the arctan of both sides...
arctan(Tan(FOV#/2.0)) = arctan(1.0)
Which ends up being:
FOV#/2.0 = arctan(1.0)
And arctan(1.0) is 45, so...
FOV#/2.0 = 45
And them we multipy both sides by 2.0 to get the result:
FOV# = 90
So there you have it. Blitz's default zoom of 1 is equivalent to a 90 degree FOV.