OrientGens

To get a current list of available orientation generators, please run e2help.py orientgens or for more detail, e2help.py orientgens -v 2.

A typical orientation generator looks like this:

• eman:delta=2.0:inc_mirror=0

Note that the perturb option is on by default in the eman orientation generator, to reduce noise bias problems.

To get a RANDOM ORIENTATION with three random values for EULER ANGELS (from positions on the "Sphere"), do the following:

{ rand_orient = OrientGens.get("rand",{"n":1}) #This fetches the orientation generator c1_sym = Symmetries.get("c1") #This generates the asymmetric unit from which you wish to generate a random orientation t3d = rand_orient.gen_orientations(c1_sym)[0] #This generates a random orientation using the orientation generator and asymmetric unit specified t = {"transform":t3d} #This makes the orientation into a Transform object that can be applied to images }