java - 如何将 LibGDX 相机与 Box2D 调试渲染器一起使用

Question

我正在尝试将 Box2D 调试渲染器与我的 LibGDX Sprites 和主体一起使用。我遇到的问题是渲染器在屏幕中央绘制 Box Body，然后在屏幕左下角的默认位置 (0,0) 绘制 Sprite。当我移动 Car Sprite 时，Car 和 Debug Box 都会移动，使它们不重叠。

我知道问题出在相机上，因为这几天我一直在摆弄不同的相机值。有时它们会重叠，但 Box2D Debug Body 的移动速度比 Car Sprite 快。

有时 Box2D 主体与 Sprite 处于相同位置但非常小。我正在使用 2 个相机。一个是 720 x 480。调试相机以米为单位，所以它是 24 x 16。

下面是一些可能存在问题的代码(我正在使用 Stages 和 Actors):

战斗画面.java:

public void show() {
    battleStage = new Stage( 720, 480, false );
    // The Box2D Debug Renderer will handle rendering all physics objects for debugging
    debugRenderer = new Box2DDebugRenderer( true, true, true, true );
    debugCam = new OrthographicCamera( 24, 16 );
}
public void render() {

    // Set the Camera matrices
    battleStage.getCamera().update();       

    // Update the Physics World, use 1/45 for something around 45 Frames/Second for mobile devices
    physicsWorld.step( 1/45.0f, 8, 3 );     // 1/45 for devices 

    // Again update the Camera matrices and call the debug renderer
    //debugCam.update();
    debugRenderer.render( physicsWorld, debugCam.combined );

    // Update all Game Objects then Draw them
    battleStage.act(delta);
    battleStage.draw();
}

Car.java:(也是 Actor )

public Car(Texture texture ) {
    super( "Car" ); 

    mSprite = new Sprite( texture );
    mSprite.setSize( 54, 105 );

    mSprite.setOrigin( mSprite.getWidth()/2, mSprite.getHeight()/2);    // set the origin to be at the center of the body

    FixtureDef carFixtureDef = new FixtureDef();
    mBody = Physics.createBoxBody( BodyType.DynamicBody, carFixtureDef, mSprite );
}

public static Body createBoxBody( final BodyType pBodyType, final FixtureDef pFixtureDef, Sprite pSprite ) {

    final BodyDef boxBodyDef = new BodyDef();
    boxBodyDef.type = pBodyType;

    // Temporary Box shape of the Body
    final PolygonShape boxPoly = new PolygonShape();
    final float halfWidth = pSprite.getWidth() * 0.5f / Consts.PIXEL_METER_RATIO;
    final float halfHeight = pSprite.getHeight() * 0.5f / Consts.PIXEL_METER_RATIO;
    boxPoly.setAsBox( halfWidth, halfHeight );  // set the anchor point to be the center of the sprite
    pFixtureDef.shape = boxPoly;

    final Body boxBody = BattleScreen.getPhysicsWorld().createBody(boxBodyDef);
    boxBody.createFixture(pFixtureDef);
    boxPoly.dispose();
    return boxBody;
}

让事情变得更糟。当我尝试让 Main Camera 跟随汽车时，它真的变得很复杂。

Answer 1

battleStage.getCamera().combined 怎么样？结合起来对我来说效果很好。