Yep, I blew it -- neglected to check my work. Scratch all of my
previous emails on the subject.
The following function (turn_y_light.py) will correctly rotate the light
in order to offset the effect of "turn y,#"
def turn_y_light(rot):
# assuming "rot" has angle in degrees
rot_rad = math.pi*rot/180.0
(X0,Y0,Z0)=cmd.get_setting_tuple("light")[1]
X1= X0*math.cos(rot_rad) + Z0*math.sin(rot_rad)
Y1= Y0
Z1= Z0*math.cos(rot_rad) - X0*math.sin(rot_rad)
cmd.set("light",[X1,Y1,Z1])
sample usage:
# first, load the function from a .py file
run turn_y_light.py
# now use it...
turn y,3
turn_y_list(3)
ray
png image1.png
turn y,-6
turn_y_light(-6)
ray
png image2.png
Sorry for the confusion!
Warren
--
mailto:[email protected]
Warren L. DeLano, Ph.D.
Principal
DeLano Scientific LLC
Voice (650)-346-1154
Fax (650)-593-4020
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Anthony
Duff
Sent: Tuesday, April 29, 2003 9:08 PM
To: [email protected]
Subject: Re: [PyMOL] RE: Stereo pictures, light vector and shadows
Warren's script is not quite right. The value -0.902 is not correct.
Apparently, my picture, with a stick peptide casting a shadow on the
inner
surface of a deep crevice, is particularly demanding.
I have done the vector calculations. See the attached excel worksheet
for
light vectors for any desired stereo angle.
I am using the script below. It produces perfect shadows and
reflections.
turn y, 3
set light=[-0.43709,-0.34800,-0.82937]
ray 1120,818
png image.l.png
turn y, -6
set light=[-0.34800,-0.34800,-0.87051]
ray 1120,818
png image.r.png
Anthony
At 05:10 AM 24/04/2003, Warren L. DeLano wrote:
>In the script I just posted, I used unit vectors to specify the light
>direction and simply rotated that vector by 6 degrees. The first
vector
>is merely [-0.4,-0.4,-1.0] normalized. The second is that same vector
>rotated 6 degrees about the Y axis.
>
>I then loaded the output into Illustrator and was able to view both
>cross-eye and wall-eye stereo pairs with clean shadows.
>
>
> >
> > Try using this sequence to create your stereo pair:
> >
> > set light=[-0.348,-0.348,-0.870]
> > ray
> > png image1.png
> > turn y,6
> > set light=[-0.437,-0.348,-0.902]
> > ray
> > png image2.png
> > turn y,-6
> >
> > Cheers,
> > Warren
----------------------------------------------------------------------
Anthony Duff
Postdoctoral Fellow
School of Molecular and Microbial Biosciences
Biochemistry Building, G08
University of Sydney, NSW 2006 Australia
Phone. 61-2-9351-7817 Fax. 61-2-9351-4726
----------------------------------------------------------------------
