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 <caiq...@gmail.com> 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: caiq...@gmail.com > School of Life Sciences, > Xiamen University, Fujian, China > **from thunderbird**
