Bakes a Maya camera's Translate rotate and focal length out, set all keys to spline tangents, and set pre/post infinity of curves to linear

20190516_bake_mm_cam_v001_01.py

from pymel.core import *
from pprint import pprint as pp

'''
BakeMmCam
version 001_01
written by Patrick Woo (patrickwoo@yahoo.com)

This script 
- bakes a Maya camera's Translate rotate and focal length out, 
- set all keys to spline tangents, 
- and set pre/post infinity of curves to linear
'''

def bakeMmCam(sel):
    try:
        camShape = sel.listRelatives(ad=True, type='camera')[0]
    except:        
        print('\nCamera not found in selection. Aborted.')
        return
        
    cam = camShape.getParent()
    
    # unlock attributes required attributes for camera transform and camera shape nodes
    bakeAttrListCam = ['tx', 'ty', 'tz', 'rx', 'ry', 'rz']
    [cam.attr(x).unlock() for x in bakeAttrListCam]
    
    bakeAttrListCamShape = ['focalLength']
    [camShape.attr(x).unlock() for x in bakeAttrListCamShape]

    # builds a string like '1001:1044' which represents 'start frame:end frame' for bakeResults
    minMax = '{}:{}'.format( playbackOptions(q=True, min=True), playbackOptions(q=True, max=True) )
    # print minMax
    bakeResults(cam, simulation=True, time=minMax, sampleBy=1, oversamplingRate=1, disableImplicitControl=True,
                preserveOutsideKeys=True, removeBakedAttributeFromLayer=False, bakeOnOverrideLayer=False,
                minimizeRotation=True, at=bakeAttrListCam)
    
    # set all animated curves on cam transform node and cam shape node to spline tangents
    for myObj in [cam, camShape]:
        interp = 'spline'
        keyTangent(myObj, inTangentType=interp, outTangentType=interp)

    # get all anim curves from cam transform
    connections = cam.listConnections(type='animCurve')
    connections += camShape.listConnections(type='animCurve') # include cam shape animated curves
    # pp(connections)
    for thisConnection in connections:
        thisConnection.setPreInfinityType('linear')
        thisConnection.setPostInfinityType('linear')
    print('\nMatchmove cam baking complete.')
    return

try:
    bakeMmCam(ls(sl=True)[0])
except:
    print('\nSelect a camera obj to bake, then run the script.')