Select the objects that should not be collided with each other and
then click the Object -> Never Collide menu. Those objects will not
collide with each other. When you have a complex model with a lot of
parts, if you type
>>> system.neverCollide
and hit enter then you can see the groups of objects that would not
collide with each other.
If you wish to use code instead of the GUI then use the noCollision
method in your code as shown below.
system.noCollision([circle1, rectangle2])
When you create pin, motor, torsional spring connectors, by default
their body1 and body2 does not collide with each other. You can
change this by typing
>>> pin1.collideConnected = True
There is no slot for the collideConnected property in the object tree
yet.