无线电广播未报告发生碰撞

Question

好的，所以我试图得到我的光线投射碰撞的对象，但我总是报告null。代码如下:

    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 Viewport viewport;
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 (1.5f,1.5f,1.5f));
    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);
    collisionWorld.addCollisionObject(collisiontestobject);
    viewport = new FitViewport(1280, 720, cam);
    Gdx.input.setInputProcessor(new BulletInputProcessor(viewport, collisionWorld));

}
@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();

}

和下一部分

public class RayTesting {
private static final Vector3 rayFrom = new Vector3();
private static final Vector3 rayTo = new Vector3();
private static final ClosestRayResultCallback callback = new ClosestRayResultCallback(rayFrom, rayTo);
public static btCollisionObject rayTest(btCollisionWorld collisionWorld, Ray ray) {
    rayFrom.set(ray.origin);
    // 50 meters max from the origin
    rayTo.set(ray.direction).scl(50f).add(rayFrom);
    // we reuse the ClosestRayResultCallback, thus we need to reset its
    // values
    callback.setCollisionObject(null);
    callback.setClosestHitFraction(1f);
    callback.getRayFromWorld().setValue(rayFrom.x, rayFrom.y, rayFrom.z);
    callback.getRayToWorld().setValue(rayTo.x, rayTo.y, rayTo.z);
    collisionWorld.rayTest(rayFrom, rayTo, callback);
    if (callback.hasHit()) {
        return callback.getCollisionObject();
    }
    return null;
}



}

对于最后一部分。

public class BulletInputProcessor extends InputAdapter {
private Viewport pickingViewport;
private btCollisionWorld collisionWorld;
// a constructor which takes a Viewport and the collision world and stores them
public BulletInputProcessor(Viewport viewport, btCollisionWorld collisionWorld){
    this.pickingViewport = viewport;
    this.collisionWorld = collisionWorld;

}
@Override
public boolean touchUp(int screenX, int screenY, int pointer, int button) {
    if (button == Input.Buttons.LEFT) {
        Ray pickRay = pickingViewport.getPickRay(screenX, screenY);
        btCollisionObject body = RayTesting.rayTest(collisionWorld, pickRay);
        if (body != null) {
            System.out.println("Test");
            return true;
        }
    }
    return false;
}

}

我完全迷路了，我理解大部分Libgdx的东西，但子弹把我弄糊涂了。顺便说一句，谢谢@noone的帮助!D

Answer 1

你的视口没有像它应该的那样更新。它的视口大小为0。这导致Ray (pickingViewport.getPickRay(...))仅由NaN(不是数字)值组成。Bullet似乎能够毫无例外地处理这个问题，但它当然不能正确工作。将以下内容添加到您的ApplicationAdapter或Screen或您正在使用的任何内容中。

@Override
public void resize(int width, int height) {
    viewport.update(width, height);
}