Ahoy,

Re:
http://wiki.povray.org/content/Reference:Camera

I'm trying to zoom in on my SpaceLoco as he flies away.  The angle 
option to the camera does exactly what I want.  I say "angle 20" and it 
is beautifully zoomed.  But I don't know why I'm saying angle 20.
I want to know what the "default" angle is.  I'm stuck trying to solve 
for angle.  Doc says:

direction_length = 0.5 * right_length / tan(angle / 2)

So:
1 = 0.5 * right_length / tan(angle/2)
1 = 0.5 * 1.69 / tan(angle/2)
1 = 0.845 / tan(angle/2)
tan(angle/2) = 0.845

and then I'm stuck. I don't know how to extract that /2 so that I can 
take the arctan.

The answer I'm looking for is 82ish. :)

I looked at screen.inc.  It allows me to Set_Camera_Angle() using the 
direction vector (which the doc says is the old/hard way) but there is 
no Get_Camera_Angle().


-- 
dik
Rendered 328976 of 330000 (99%)

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