The polar angles ϕ, ω define the direction of an axis about which a rotation by angle κ occurs, i.e. a single rotation around a defined axis. This is different from Eulerian angles which define 3 successive rotations around principal axes
On 27 Mar 2014, at 06:11, Qixu Cai <[log in to unmask]> wrote:
> Dear all,
>
> From the definition of CCP4 (http://www.ccp4.ac.uk/html/rotationmatrices.html), the polar angle (ϕ, ω, κ) can be visualised as rotation ϕ about Z, rotation ω about the new Y, rotation κ about the new Z. It seems the same as the ZXZ convention of eulerian angle definition. What's the difference between the CCP4 polar angle definition and eulerian angle ZXZ definition?
>
> And what's the definition of polar angle XYK convention in GLRF program?
>
> Thank you very much!
>
> Best wishes,
>
> --
> Qixu Cai
> Email: [log in to unmask]
> School of Life Sciences,
> Xiamen University, Fujian, China
> **from thunderbird**
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