I'm trying to occlude a virtual object with a real one - I have modelled the real object, saved it as an IVE, however I cannot get it to perform correctly?? 
Here is the code I am using:
	Code:
	box = viz.add('Box_Occlude.ive')
occluder = viz.add('Box_Cam_Calib.IVE')
occluder.drawOrder(-1)
occluder.disable(viz.COLOR_WRITE)
 I have read how others have had success, but this is not working for me? 
I have attached the models as a zip file. 
I'm hoping it is something nice and simple because I have been kind-of relying on the fact that I could do this within Vizard 
Any help with this would be much appreciated