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A locator node that visualize the field of view of the camera.
copy MEL to maya/scripts/others
copy MLL and PY to maya/bin/plug-ins
load MLL in maya 7.0
load PY in maya newer-than-7.0
select a camera, choose Rendering->*zTools->Attach Camera Frustum
Version 3.0 has menu item to create the node. Orthographic cameras can be visualized as well. Python script is supposed to be working on all versions of Maya with Python API. MLL is still available for Maya 7.0 users.