Physics with Bullet - jMonkeyEngine 3.0 - page 405

How to do it...
We will begin by setting up some things that are not strictly needed for the rocket engine
but will aid the testing. Perform the following steps to build a rocket engine:
1. First of all we add a floor mesh. For this, we create a new Node class called
ground .
2. To do this, we add RigidBodyControl with PlaneCollisionShape . The
plane should face upwards like floors normally do, as follows:
RigidBodyControl floorControl = new
RigidBodyControl(new PlaneCollisionShape(new Plane(new
Vector3f(0, 1, 0), 0)), 0);
ground.addControl(floorControl);
floorControl.setPhysicsLocation(new Vector3f(0f, -10,
0f));
3. We then attach them both to rootNode of the application and physicsSpace
of bulletAppState .
4. Finally, we need to add a key to control the booster. For this, we implement an
AnalogListener interface in our application.
5. Then, add the application to inputManager along with a mapping object called
boost that is bound to the Space bar:
inputManager.addListener(this, "boost");
inputManager.addMapping("boost", new
KeyTrigger(KeyInput.KEY_SPACE));
6. Most of this recipe will be implemented in a class that extends SimpleApplic-
ation .
7. We begin by defining a Node class called spaceShip that will be our space-
ship's representation.
8. We then create a RigidBodyControl instance with BoxCollisionShape
and add it to the spaceShip node as follows:
RigidBodyControl control = new RigidBodyControl(new
BoxCollisionShape(new Vector3f(1, 1, 1)), 1);
spaceShip.addControl(control);