> I still do not understand your stereo parameters: the
> stereo_angle should
> define the rotation (around the y-axis) between the pictures
> for the left and
> right eye, whereas the stereo_shift should define whether the
> origin or
> midpoint of the picture is within the plane of the screen or
> in front of or
> behind it. However, changing the settings of these parameters lead to
> completely unexpected results: setting the stereo_shift to
> "0" and the
> stereo_angle to "3.0" results in a mono picture with no
> separation at all,
> whereas setting the stereo_shift to "3.0" and the
> stereo_angle to "0" leads
> also to a mono picture shifted to the back. So, could you
> please check this
> and maybe explain it again to me?
After looking back at the code, I realize that these parameters
are perhaps misnamed. These are not the rotations of the objective, but
rather parameters input into the stereo equations.
stereo_shift is the separation between the two cameras observing the
image, expressed as a % of the distance from the objective.
stereo_angle is a scaling factor applied to the natural angular
difference which would occur between two eyes at that distance, both
looking at the objective.
Generally speaking stereo_shift is the main depth control parameter, and
stereo_angle should remain close to 2 in order to generate "correct"
stereo geometry. However, adjusting stereo_angle can reduce ghosting
and change the apparent Z location of the objective.
Detting stereo_shift to zero makes you a Cyclops (you're basically
telling PyMOL that your eyes are superimposed).
The defaults are:
PyMOL>get stereo_shift,
get: stereo_shift = 2.00000
PyMOL>get stereo_angle,
get: stereo_angle = 2.10000
which are tuned to minimize CrystalEyes "ghosting" in the foreground.
The actual translation(+/-) and rotation(+/-) of the camera at
"distance" are:
translation = distance * (stereo_shift/100)
rotation = (stereo_angle/2) * (arctan(stereo_shift/100))
(default = +/- 1.2 deg)
If you want a stronger stereo effect, set stereo_shift to 3, 4, or 5
(resulting in rotations of 1.8, 2.4, and 3.0 degrees, respectively).
Cheers,
Warren
