vtkRenderWindowInteractor - provide event driven interface to rendering window

Mouse bindings:
camera: Button 1 - rotate
Button 2 - pan
Button 3 - zoom
ctrl-Button 1 - spin
actor: Button 1 - rotate
Button 2 - pan
Button 3 - uniform scale
ctrl-Button 1 - spin
ctrl-Button 2 - dolly.
Keyboard bindings (upper or lower case):
j - joystick like mouse interactions
t - trackball like mouse interactions
o - object/ actor interaction
c - camera interaction
r - reset camera view
w - turn all actors wireframe
s - turn all actors surface
u - execute user defined function
p - pick actor under mouse pointer (if pickable)
3 - toggle in/out of 3D mode (if supported by renderer)
e - exit
q - exit