Angular Velocity in the Physics Engine?

Scripting Issues
#1

I’ve been playing around with the physics engine for the past few hours, and while the force support is not bad at all so far, I’ve run across a problem.

The problem is that, no matter how hard I try, I cannot give my object any sort of angular velocity. I’ve tried setting it directly using PhysicsObject.setRotation, applying and AngularVectorForce to the Physical object, and by using non-centered PhysicsObject.addImpact calls.

Some example code (trimmed down quite a bit):


	# Load car
	car1_actor = ActorNode('actor')
	car1 = render.attachNewNode(car1_actor)
	car1_mesh = loader.loadModel('cars/test.egg') 
	car1_mesh.reparentTo(car1)
	car1.setPos(0,0,30)
	
	# Set up car physics
	base.physicsMgr.attachPhysicalNode(car1_actor)
	
	# Create force nodes
	forcen_car_node = ForceNode('car')
	forcen_car = car1.attachNewNode(forcen_car_node)
	
	forcen_global_node = ForceNode('global')
	forcen_global = render.attachNewNode(forcen_global_node)
	
	spin = AngularVectorForce(0, 0, -2)
	forcen_global_node.addForce(spin)
	
	engine = LinearVectorForce(0, 0, 0)
	friction = LinearFrictionForce(1,1,1) 
	forcen_car_node.addForce(engine)
	forcen_car_node.addForce(friction)
	
	# Add those forces to the car
	car1_physical = car1_actor.getPhysical(0)
	car1_physical.addLinearForce(friction)
	car1_physical.addLinearForce(engine)
	car1_physical.addAngularForce(spin)

So, is there some obvious problem I’m missing, like an optimisation I have to deal with?

#2

OK, solved that one myself. Turns out you need to attach an AngularIntegrator explicitly using PhysicsManager.attachAngularIntegrator.

And the wiki page made it look so easy…