How can I collect all the cameras in a Maya scene excluding the default 'perspective, top, front, side' cameras?
I only want to collect the user created cameras.
cameras = cmds.ls(type=('camera'), l=True) or []
print cameras
Do I need to do listRelatives for any reason? I eventually just want to print the world Matrix of each camera.
To weed out default cameras, you could query for startupCamera using the cmds.camera. Here is some code (with comments) to explain.
# Let's use Pymel for fun
import pymel.core as pm
# Get all cameras first
cameras = pm.ls(type=('camera'), l=True)
# Let's filter all startup / default cameras
startup_cameras = [camera for camera in cameras if pm.camera(camera.parent(0), startupCamera=True, q=True)]
# non-default cameras are easy to find now. Please note that these are all PyNodes
non_startup_cameras_pynodes = list(set(cameras) - set(startup_cameras))
# Let's get their respective transform names, just in-case
non_startup_cameras_transform_pynodes = map(lambda x: x.parent(0), non_startup_cameras_pynodes)
# Now we can have a non-PyNode, regular string names list of them
non_startup_cameras = map(str, non_startup_cameras_pynodes)
non_startup_cameras_transforms = map(str, non_startup_cameras_transform_pynodes)
import maya.cmds as cmds
# Get all cameras first
cameras = cmds.ls(type=('camera'), l=True)
# Let's filter all startup / default cameras
startup_cameras = [camera for camera in cameras if cmds.camera(cmds.listRelatives(camera, parent=True)[0], startupCamera=True, q=True)]
# non-default cameras are easy to find now.
non_startup_cameras = list(set(cameras) - set(startup_cameras))
# Let's get their respective transform names, just in-case
non_startup_cameras_transforms = map(lambda x: cmds.listRelatives(x, parent=True)[0], non_startup_cameras)
Some further reading: http://ewertb.soundlinker.com/mel/mel.082.php