Export Nuke chan

export_chan.py

import pymel.core as pm
import math

def exportCameraChan(obj, st, ed, filename):
    
    bt = pm.currentTime( query=True )
    
    fd = open(filename, 'wt')
    
    for i in range(ed-st):
        pm.currentTime(i+st)
        t = obj.getTranslation()
        r = obj.getRotation()
        vfov = 2 * (math.atan2(obj.getVerticalFilmAperture()/2.0*25.4,obj.getFocalLength()) * 180 / math.pi);

        ap = math.tan(obj.getHorizontalFieldOfView()/2*(math.pi/180)) * obj.getFocalLength()* 2
        # folowing name of channel for Nuke. 
        # tx ty tz rx ry rz aperture focal
        fd.write( "%d\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n" % (i+st, t[0], t[1], t[2], r[0], r[1], r[2],  vfov ) )
    
    fd.close()
    
    pm.currentTime(bt)
    

filename = pm.fileDialog( dfn='camera.chan', dm='*.chan', mode=1 )

if filename:
    st = pm.playbackOptions(query=True, minTime=True)
    ed = pm.playbackOptions(query=True, maxTime=True)
    # need selected camera
    exportCameraChan(pm.selected()[0], int(st), int(ed), filename)