Location of physics demo files:
With the standard Vizard 2.5xx installation, the physics files can be found at
program files / vizard25/examples/physics.
The one that shows the intersect is physics2.py.
Driving simulation tutorial:
You might have already seen this, but a tutorial that shows how to put together a basic driving demo can be found at:
http://www.worldviz.com/vizhelp/VizH...nt_control.htm