[3dem] Transfer of Spider Euler angles to UCSF Chimera

Tanvir Shaikh tapu at wadsworth.org
Tue Dec 15 10:06:50 PST 2009

On Tue, 15 Dec 2009, Penczek, Pawel A wrote:
> the simplest way is to notice that chimera "views" the volume along z
> axis.  So, instead of transfering the angles you can rotate the volume
> in spider according to pjsq angles and display the rotated version in
> chimera.
> I hope you can figure the rest.

The following isn't elegant, but it preserves SPIDER's convention of
phi, theta, and psi:

turn x 180
turn y 90
turn x phi
turn y 90-theta
turn z psi

I concatenate these which semicolons and retrieve it from Chimera's
command history so that I don't have to remember it.  Keep in mind that
PJ 3Q reads in the output of VO EA as (psi (likely zero), theta, phi).


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