[farshizzo]

The viz.MOUSEDOWN_EVENT is only triggered when the mouse is clicked on the main graphics window. If you want to monitor mouse clicks that occur outside the main graphics window, you can create a timer that checks the immediate state of the mouse buttons. Here is some sample code:

lastState = 0
def CheckMouseDown():
	global lastState
	state = viz.mouse.getState(True)
	if state & viz.MOUSEBUTTON_LEFT and not lastState & viz.MOUSEBUTTON_LEFT:
		print 'mouse down'
	lastState = state
vizact.ontimer(0,CheckMouseDown)