我试图以世界单位获取触摸坐标，以便可以使用viewport.unproject（Vector3）在屏幕上绘制纹理，但它返回的是NaN。
我的视口和相机的状态如下：
public class GameRenderer {
private InvadersGame game;
private Viewport viewport;
private OrthographicCamera camera;
private SpriteBatch batch;
private Animation<TextureRegion> shipAnimation;
private TextureRegion currentShipFrame;
private Ship ship;
private CameraDebug cameraDebug;
private DebugCameraConfig debugCameraConfig;
private TextureAtlas shipAtlas;
private float timeElapsed;
public GameRenderer(InvadersGame game) {
this.game = game;
init();
}
private void init() {
camera = new OrthographicCamera();
viewport = new FitViewport(GameConfig.WORLD_WIDTH, GameConfig.WORLD_HEIGHT, camera);
batch = new SpriteBatch();
shipAtlas = new TextureAtlas(Gdx.files.internal(AssetPaths.shipAnimation));
shipAnimation = new Animation<TextureRegion>(1/10f, shipAtlas.findRegions("ship"), Animation.PlayMode.LOOP);
ship = new Ship();
cameraDebug = new CameraDebug();
debugCameraConfig = new DebugCameraConfig();
}
. . .
我有一个GameScreen类，该类实现屏幕并具有GameRenderer的实例，因此调用了init（）方法。
这是我尝试过的：
Public class GameController
. . .
private void updateShip() {
ship.setPositions(renderer.getViewport().unproject(ship.getTouchPos()));
log.debug(Float.toString(renderer.getViewport().unproject(ship.getTouchPos()).x));
}
. . .
其中ship.getTouchPos返回Gdx.input.getX（）和y的Vector3。
显然，我在GameController中有一个GameRenderer实例，以获取视口并将其用于将触摸坐标转换为世界坐标。
log.debug输出：
I/chatty: uid=10133(com.mygdx.game) GLThread 342 identical 2 lines
D/GameController: NaN
D/GameController: NaN
