collision callback method, we will set the collision markers and objects, so that we can act on them during the
Selectstatement on the first object's collision group.
Method OnObjectCollision:Int(obj:ftObject, obj2:ftObject) Select obj.GetColGroup()
True. We do this by checking the collision group of the second object.
If obj2.GetColGroup()=g.grpPlayer2 Then g.hitWall2=True
If obj2.GetColGroup()=g.grpPlayer ...