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← Revision 9 as of 2012-01-24 21:36:46 ⇥
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| To get a RANDOM ORIENTATION with three random values for EULER ANGELS (from positions on the "Sphere"), do the following: | To get a RANDOM ORIENTATION __within a python script__ with three random values (one for each EULER ANGLE, from positions on "the sphere"), do the following: |
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| { 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 } |
{{{ rand_orient = OrientGens.get("rand",{"n":1}) #Fetches the orientation generator c1_sym = Symmetries.get("c1") #Generates the asymmetric unit from which you wish #to generate a random orientation rt = rand_orient.gen_orientations(c1_sym)[0] #Generates a random orientation (a Transform object) #using the generator and asymmetric unit specified }}} |
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 within a python script with three random values (one for each EULER ANGLE, from positions on "the sphere"), do the following:
rand_orient = OrientGens.get("rand",{"n":1}) #Fetches the orientation generator
c1_sym = Symmetries.get("c1") #Generates the asymmetric unit from which you wish
#to generate a random orientation
rt = rand_orient.gen_orientations(c1_sym)[0] #Generates a random orientation (a Transform object)
#using the generator and asymmetric unit specified