[Gladsomebeast]

viz.grab() with the mouse makes sense if the object you are grabbing is on the screen.

import viz
viz.go()


screenText = viz.addText('GrabME', viz.SCREEN)
s = 1
screenText.scale(s,s,s)
screenText.setPosition(.5, .5)

grabLink = None

def onMouseDown(button):
	global grabLink
	if grabLink:
		#in case we missed mouse up event
		grabLink.remove()
	grabLink = viz.grab( viz.Mouse, screenText )

viz.callback(viz.MOUSEDOWN_EVENT,onMouseDown)


def onMouseUp(button):
	global grabLink
	grabLink.remove()
	grabLink = None

viz.callback(viz.MOUSEUP_EVENT,onMouseUp)