Question

我想从我的模型实例中获取3d坐标（作为Vector3）。使用下面的代码我只能获得原始坐标，但在渲染方法中，我的模型围绕Y轴旋转（并同时移动），我希望每帧得到它的坐标。

我正在使用@Xoppa创建的一个小课程：

public static class GameObject extends ModelInstance {
    public Vector3 center = new Vector3();
    public Vector3 dimensions = new Vector3();
    public float radius;

    public BoundingBox bounds = new BoundingBox();

    public GameObject (Model model, String rootNode, boolean mergeTransform) {
        super(model, rootNode, mergeTransform);
        calculateBoundingBox(bounds);
        bounds.getCenter(center);
        bounds.getDimensions(dimensions);
        radius = dimensions.len() / 2f;
    }
}

这是我的代码：

public void render(float delta) {
    super.render(delta);
    if (loading && manager.update()) {
        doneLoading();
    }

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

    batch.begin();
    backgroundSprite.draw(batch);
    batch.end();

    for(GameObject instance : instances){
        instance.transform.rotate(new Vector3(0, 1, 0), 0.5f);
        float x = instance.bounds.getCenterX();
        float y = instance.bounds.getCenterY();
        float z = instance.bounds.getCenterZ();
        System.out.println(x+" "+y+" "+z);
        if(isVisible(cam, instance)){
            modelBatch.begin(cam);
            modelBatch.render(instance, environment);
            modelBatch.end();
        }
    }
}

没有任何功能＆＃34; getPosition＆＃34;或类似的东西，它完全是关于Matrix4的，我从未有过关于它的数学课程。我被卡住了。

Answer 1

GameObject类：

public static class GameObject extends ModelInstance {
    public Vector3 center = new Vector3();
    public Vector3 dimensions = new Vector3();
    public float radius;
    public final Vector3 position = new Vector3();
    public final Quaternion rotation = new Quaternion();
    public final Vector3 scale = new Vector3();

    public BoundingBox bounds = new BoundingBox();

    public GameObject (Model model, String rootNode, boolean mergeTransform) {
        super(model, rootNode, mergeTransform);
        calculateBoundingBox(bounds);
        bounds.getCenter(center);
        bounds.getDimensions(dimensions);
        radius = dimensions.len() / 2f;
    }

    public void updateTransform() {
        this.transform.set(position, rotation, scale);
    }
}`

它只返回（0,0,0），当我使用updateTransform方法时，它甚至不会渲染。

很抱歉有多个答案。我不知道如何在评论部分格式化

如何在LibGDX中获取模型实例的3d坐标？

1 个答案: