jMonkeyEngine/jme3-examples/src/main/java/jme3test/bullet/TestGhostObject.java

/*
 * Copyright (c) 2009-2012 jMonkeyEngine
 * All rights reserved.
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 * * Redistributions in binary form must reproduce the above copyright
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 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package jme3test.bullet;

import com.jme3.app.Application;
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.CollisionShape;
import com.jme3.bullet.control.GhostControl;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.math.Vector3f;
import com.jme3.scene.Node;
import com.jme3.scene.shape.Box;

/**
 *
 * @author tim8dev [at] gmail [dot com]
 */
public class TestGhostObject extends SimpleApplication {

    private BulletAppState bulletAppState;
    private GhostControl ghostControl;

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

    @Override
    public void simpleInitApp() {
        bulletAppState = new BulletAppState();
        stateManager.attach(bulletAppState);
        bulletAppState.setDebugEnabled(true);

        // Mesh to be shared across several boxes.
        Box boxGeom = new Box(Vector3f.ZERO, 1f, 1f, 1f);
        // CollisionShape to be shared across several boxes.
        CollisionShape shape = new BoxCollisionShape(new Vector3f(1, 1, 1));

        Node physicsBox = PhysicsTestHelper.createPhysicsTestNode(assetManager, shape, 1);
        physicsBox.setName("box0");
        physicsBox.getControl(RigidBodyControl.class).setPhysicsLocation(new Vector3f(.6f, 4, .5f));
        rootNode.attachChild(physicsBox);
        getPhysicsSpace().add(physicsBox);

        Node physicsBox1 = PhysicsTestHelper.createPhysicsTestNode(assetManager, shape, 1);
        physicsBox1.setName("box1");
        physicsBox1.getControl(RigidBodyControl.class).setPhysicsLocation(new Vector3f(0, 40, 0));
        rootNode.attachChild(physicsBox1);
        getPhysicsSpace().add(physicsBox1);

        Node physicsBox2 = PhysicsTestHelper.createPhysicsTestNode(assetManager, new BoxCollisionShape(new Vector3f(1, 1, 1)), 1);
        physicsBox2.setName("box0");
        physicsBox2.getControl(RigidBodyControl.class).setPhysicsLocation(new Vector3f(.5f, 80, -.8f));
        rootNode.attachChild(physicsBox2);
        getPhysicsSpace().add(physicsBox2);

        // the floor, does not move (mass=0)
        Node node = PhysicsTestHelper.createPhysicsTestNode(assetManager, new BoxCollisionShape(new Vector3f(100, 1, 100)), 0);
        node.setName("floor");
        node.getControl(RigidBodyControl.class).setPhysicsLocation(new Vector3f(0f, -6, 0f));
        rootNode.attachChild(node);
        getPhysicsSpace().add(node);

        initGhostObject();
    }

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

    private void initGhostObject() {
        Vector3f halfExtents = new Vector3f(3, 4.2f, 1);
        ghostControl = new GhostControl(new BoxCollisionShape(halfExtents));
        Node node=new Node("Ghost Object");
        node.addControl(ghostControl);
        rootNode.attachChild(node);
        getPhysicsSpace().add(ghostControl);
    }

    @Override
    public void simpleUpdate(float tpf) {
        fpsText.setText("Overlapping objects: " + ghostControl.getOverlappingObjects().toString());
    }
}