Libgdx bullet show collision objects

Question

Alright so I would like to know why when i run this i cannot see the bullet collision objects Prob. a rookie mistake

    public static PerspectiveCamera cam;
static btCollisionWorld collisionWorld;
DebugDrawer debugDrawer;
public ModelBatch modelBatch;
btCollisionConfiguration collisionConfig;
static btDispatcher dispatcher;
btBroadphaseInterface broadphase;
public static btCollisionShape voxelShape;
public static Model model;
public static ModelInstance test;
public static btCollisionShape collisiontest;
public static btCollisionObject collisiontestobject;

@Override
public void create () {
    Bullet.init();
    collisionConfig = new btDefaultCollisionConfiguration();
    dispatcher = new btCollisionDispatcher(collisionConfig);
    broadphase = new btDbvtBroadphase();
    collisionWorld = new btCollisionWorld(dispatcher, broadphase, collisionConfig);

    cam = new PerspectiveCamera(67, 1280, 720);
    cam.position.set(10f,10f,10f);
    cam.lookAt(0,0,0);
    cam.near = 1f;
    cam.far = 300f;
    cam.update();

    modelBatch = new ModelBatch();


    ModelBuilder modelBuilder = new ModelBuilder();
    model = modelBuilder.createBox(3f, 3f, 3f,
            new Material(ColorAttribute.createDiffuse(Color.BLUE)),
            Usage.Position | Usage.Normal);

    test = new ModelInstance(model);

    test.transform.setTranslation(0,0,0);

    collisiontest = new btBoxShape(new Vector3 (6f,6f,6f));

    collisiontestobject = new btCollisionObject();
    collisiontestobject.setCollisionShape(collisiontest);
    collisiontestobject.setWorldTransform(new Matrix4());

    debugDrawer = new DebugDrawer();
    debugDrawer.setDebugMode(btIDebugDraw.DebugDrawModes.DBG_MAX_DEBUG_DRAW_MODE);

    collisionWorld.setDebugDrawer(debugDrawer);


}

@Override
public void render () {

    cam.update();


    Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);


    debugDrawer.begin(cam);
    collisionWorld.debugDrawWorld();
    debugDrawer.end();

    //modelBatch.begin(cam);
    //modelBatch.render(test);
    //modelBatch.end();


}

When i run this I expected to see the frames of the collision objects but instead I see nothing... This was a test program i created due to having alot of bullet issues..

score 2 · Accepted Answer · answered Jul 30 '14 at 04:59

2

You are doing everything correct, only a single thing is missing:

collisionWorld.addCollisionObject(collisiontestobject);

After creating the object, you still need to add it to the collision world. That's why the DebugDrawer does not render anything. It simply doesn't know about this object.

answered Jul 30 '14 at 04:59

noone

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0.0 You sir have helped me so much *I think this is why i've been having so many issues with bullet! i never added it to a world 0.0.* Again thank you so much! – Jul 30 '14 at 15:01

Libgdx bullet show collision objects

1 Answers1