export opticals animation from motion builder

motion_builder_pc.py

import pyfbsdk as fb
def CreateParentConstraint(parent, child, offset, weight): 
    ##Get Object By Name
    def GetObjectByName(name):
        lModel = fb.FBFindModelByLabelName(name) 
        return lModel
     
    ##Set Parent Object    
    objParent = GetObjectByName(parent)
    ##Set Child Object
    objChild = GetObjectByName(child)
    print objParent.Name, ">>>", objChild.Name
    ##Create "Parent/Child" Constraint 
    for i in range( fb.FBConstraintManager().TypeGetCount() ):
        if "Parent/Child" in fb.FBConstraintManager().TypeGetName(i):
            lMyConstraint = fb.FBConstraintManager().TypeCreateConstraint(i)
         
    #for index, element in enumerate(selected_objects):
    lMyConstraint.ReferenceAdd (0, objChild)
    lMyConstraint.ReferenceAdd (1, objParent)
     
    #Snap if user desires
    if offset == True:
        lMyConstraint.Snap()
     
    #weight of the constraint
    lMyConstraint.Weight = weight
     
    ##Activate Constraint
    lMyConstraint.Active = True
    


opticals_grp = fb.FBFindModelByLabelName("Opticals")
for opt in opticals_grp.Children:
    if not "CREW" in opt.Name:
        null_object = fb.FBModelCube("{0}_null".format(opt.Name))
        null_object.Show=True
        parent_trans = opt.Translation
        null_object.Translation=fb.FBVector3d(parent_trans[0],
                                            parent_trans[1],
                                            parent_trans[2])
                                            
        CreateParentConstraint(opt.Name,
                            "{0}_null".format(opt.Name),
                            False,
                            100.0)