[farshizzo]

You can disable viz.RENDERING on a node to prevent it from being displayed, but still allow it to be picked. Here is an example that splits the screen into 4 zones and prints out which zone was clicked when the mouse button is pressed. This should give you an idea of how to assign arbitrary zones to the screen.

import viz
import vizact
import vizshape
viz.go()

ZONE_POSITIONS = [ (0.25,0.25,0), (0.25,0.75,0), (0.75,0.75,0), (0.75,0.25,0) ]

zones = []
for pos in ZONE_POSITIONS:
	z = vizshape.addQuad(size=(0.5,0.5),pos=pos,parent=viz.SCREEN)
	z.disable(viz.RENDERING)
	zones.append(z)

def PickZone():
	node = viz.pick(mode=viz.SCREEN)
	if node in zones:
		print 'picked zone',zones.index(node)

vizact.onmousedown(viz.MOUSEBUTTON_LEFT,PickZone)