jmonkeyengine/engine/src/test/jme3test/bullet/TestPhysicsCar.java

/*
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package jme3test.bullet;

import com.jme3.app.SimpleApplication;
import com.jme3.bullet.BulletAppState;
import com.jme3.bullet.PhysicsSpace;
import com.jme3.bullet.collision.shapes.BoxCollisionShape;
import com.jme3.bullet.collision.shapes.CompoundCollisionShape;
import com.jme3.bullet.control.VehicleControl;
import com.jme3.input.KeyInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Matrix3f;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.shape.Cylinder;

public class TestPhysicsCar extends SimpleApplication implements ActionListener {

    private BulletAppState bulletAppState;
    private VehicleControl vehicle;
    private final float accelerationForce = 1000.0f;
    private final float brakeForce = 100.0f;
    private float steeringValue = 0;
    private float accelerationValue = 0;
    private Vector3f jumpForce = new Vector3f(0, 3000, 0);

    public static void main(String[] args) {
        TestPhysicsCar app = new TestPhysicsCar();
        app.start();
    }

    @Override
    public void simpleInitApp() {
        bulletAppState = new BulletAppState();
        stateManager.attach(bulletAppState);
        bulletAppState.getPhysicsSpace().enableDebug(assetManager);
        PhysicsTestHelper.createPhysicsTestWorld(rootNode, assetManager, bulletAppState.getPhysicsSpace());
        setupKeys();
        buildPlayer();
    }

    private PhysicsSpace getPhysicsSpace(){
        return bulletAppState.getPhysicsSpace();
    }

    private void setupKeys() {
        inputManager.addMapping("Lefts", new KeyTrigger(KeyInput.KEY_H));
        inputManager.addMapping("Rights", new KeyTrigger(KeyInput.KEY_K));
        inputManager.addMapping("Ups", new KeyTrigger(KeyInput.KEY_U));
        inputManager.addMapping("Downs", new KeyTrigger(KeyInput.KEY_J));
        inputManager.addMapping("Space", new KeyTrigger(KeyInput.KEY_SPACE));
        inputManager.addMapping("Reset", new KeyTrigger(KeyInput.KEY_RETURN));
        inputManager.addListener(this, "Lefts");
        inputManager.addListener(this, "Rights");
        inputManager.addListener(this, "Ups");
        inputManager.addListener(this, "Downs");
        inputManager.addListener(this, "Space");
        inputManager.addListener(this, "Reset");
    }

    private void buildPlayer() {
        Material mat = new Material(getAssetManager(), "Common/MatDefs/Misc/Unshaded.j3md");
        mat.getAdditionalRenderState().setWireframe(true);
        mat.setColor("Color", ColorRGBA.Red);

        //create a compound shape and attach the BoxCollisionShape for the car body at 0,1,0
        //this shifts the effective center of mass of the BoxCollisionShape to 0,-1,0
        CompoundCollisionShape compoundShape = new CompoundCollisionShape();
        BoxCollisionShape box = new BoxCollisionShape(new Vector3f(1.2f, 0.5f, 2.4f));
        compoundShape.addChildShape(box, new Vector3f(0, 1, 0));

        //create vehicle node
        Node vehicleNode=new Node("vehicleNode");
        vehicle = new VehicleControl(compoundShape, 400);
        vehicleNode.addControl(vehicle);

        //setting suspension values for wheels, this can be a bit tricky
        //see also https://docs.google.com/Doc?docid=0AXVUZ5xw6XpKZGNuZG56a3FfMzU0Z2NyZnF4Zmo&hl=en
        float stiffness = 60.0f;//200=f1 car
        float compValue = .3f; //(should be lower than damp)
        float dampValue = .4f;
        vehicle.setSuspensionCompression(compValue * 2.0f * FastMath.sqrt(stiffness));
        vehicle.setSuspensionDamping(dampValue * 2.0f * FastMath.sqrt(stiffness));
        vehicle.setSuspensionStiffness(stiffness);
        vehicle.setMaxSuspensionForce(10000.0f);

        //Create four wheels and add them at their locations
        Vector3f wheelDirection = new Vector3f(0, -1, 0); // was 0, -1, 0
        Vector3f wheelAxle = new Vector3f(-1, 0, 0); // was -1, 0, 0
        float radius = 0.5f;
        float restLength = 0.3f;
        float yOff = 0.5f;
        float xOff = 1f;
        float zOff = 2f;

        Cylinder wheelMesh = new Cylinder(16, 16, radius, radius * 0.6f, true);

        Node node1 = new Node("wheel 1 node");
        Geometry wheels1 = new Geometry("wheel 1", wheelMesh);
        node1.attachChild(wheels1);
        wheels1.rotate(0, FastMath.HALF_PI, 0);
        wheels1.setMaterial(mat);
        vehicle.addWheel(node1, new Vector3f(-xOff, yOff, zOff),
                wheelDirection, wheelAxle, restLength, radius, true);

        Node node2 = new Node("wheel 2 node");
        Geometry wheels2 = new Geometry("wheel 2", wheelMesh);
        node2.attachChild(wheels2);
        wheels2.rotate(0, FastMath.HALF_PI, 0);
        wheels2.setMaterial(mat);
        vehicle.addWheel(node2, new Vector3f(xOff, yOff, zOff),
                wheelDirection, wheelAxle, restLength, radius, true);

        Node node3 = new Node("wheel 3 node");
        Geometry wheels3 = new Geometry("wheel 3", wheelMesh);
        node3.attachChild(wheels3);
        wheels3.rotate(0, FastMath.HALF_PI, 0);
        wheels3.setMaterial(mat);
        vehicle.addWheel(node3, new Vector3f(-xOff, yOff, -zOff),
                wheelDirection, wheelAxle, restLength, radius, false);

        Node node4 = new Node("wheel 4 node");
        Geometry wheels4 = new Geometry("wheel 4", wheelMesh);
        node4.attachChild(wheels4);
        wheels4.rotate(0, FastMath.HALF_PI, 0);
        wheels4.setMaterial(mat);
        vehicle.addWheel(node4, new Vector3f(xOff, yOff, -zOff),
                wheelDirection, wheelAxle, restLength, radius, false);

        vehicleNode.attachChild(node1);
        vehicleNode.attachChild(node2);
        vehicleNode.attachChild(node3);
        vehicleNode.attachChild(node4);
        rootNode.attachChild(vehicleNode);

        getPhysicsSpace().add(vehicle);
    }

    @Override
    public void simpleUpdate(float tpf) {
        cam.lookAt(vehicle.getPhysicsLocation(), Vector3f.UNIT_Y);
    }

    public void onAction(String binding, boolean value, float tpf) {
        if (binding.equals("Lefts")) {
            if (value) {
                steeringValue += .5f;
            } else {
                steeringValue += -.5f;
            }
            vehicle.steer(steeringValue);
        } else if (binding.equals("Rights")) {
            if (value) {
                steeringValue += -.5f;
            } else {
                steeringValue += .5f;
            }
            vehicle.steer(steeringValue);
        } else if (binding.equals("Ups")) {
            if (value) {
                accelerationValue += accelerationForce;
            } else {
                accelerationValue -= accelerationForce;
            }
            vehicle.accelerate(accelerationValue);
        } else if (binding.equals("Downs")) {
            if (value) {
                vehicle.brake(brakeForce);
            } else {
                vehicle.brake(0f);
            }
        } else if (binding.equals("Space")) {
            if (value) {
                vehicle.applyImpulse(jumpForce, Vector3f.ZERO);
            }
        } else if (binding.equals("Reset")) {
            if (value) {
                System.out.println("Reset");
                vehicle.setPhysicsLocation(Vector3f.ZERO);
                vehicle.setPhysicsRotation(new Matrix3f());
                vehicle.setLinearVelocity(Vector3f.ZERO);
                vehicle.setAngularVelocity(Vector3f.ZERO);
                vehicle.resetSuspension();
            } else {
            }
        }
    }
}