Re: [PyMOL] RE: Stereo pictures, light vector and shadows

[Anthony D. <A....@us...>]

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

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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
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