Transformations in the context of projections, reconstructions, and in general

Transforming an EMData object

An EMData object may be transformed using the following syntax 

   1 e = EMData("mydata.hdf")
   2 t = Transform3D(EULER_EMAN,10,23,0) # three angles in the EMAN convention are az=10,alt=23,phi=0. 
   3 # The convention may also be EULER_SPIDER, EULER_IMAGIC, EULER_MRC, EULER_SPIN, EULER_XYZ
   4 t.set_pretrans(1,1,1)
   5 t.set_postrans(2,2,2)
   6 e.rotate_translate(t)

This next section will look better once we get mathml working

A pixel given at coordinate vector v = [x,y,z]^T will be transformed using the following"

vhat = T_post R T_pre v

Where the rotation matrix R is as defined in Baldwin and Penczek 2007.

Transforms and Euler Angles in the context of Projections