jMonkeyEngine摄像机跟踪

Question

我正在用jMonkeyEngine测试一些东西，我试图让相机跟随一个盒子空间。我在此遵照官方指示：

http://jmonkeyengine.org/wiki/doku.php/jme3:advanced:making_the_camera_follow_a_character

在申请时，我在那里学到的东西产生了以下代码：

@Override
public void simpleInitApp() {
    flyCam.setEnabled(false);

    //world objects
    Box b = new Box(Vector3f.ZERO, 1, 1, 1);
    Geometry geom = new Geometry("Box", b);

    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    mat.setColor("Color", ColorRGBA.Blue);
    geom.setMaterial(mat);

    rootNode.attachChild(geom);

    //Ship node
    shipNode = new Node();
    rootNode.attachChild(shipNode);

    //Ship
    Box shipBase = new Box(new Vector3f(0, -1f, 10f), 5, 0.2f, 5);
    Geometry shipGeom = new Geometry("Ship Base", shipBase);

    Material shipMat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    shipMat.setColor("Color", ColorRGBA.Green);
    shipGeom.setMaterial(shipMat);

    shipNode.attachChild(shipGeom);

    //Camera node
    cameraNode = new CameraNode("Camera Node", cam);
    cameraNode.setControlDir(ControlDirection.CameraToSpatial);
    shipNode.attachChild(cameraNode);

    initPhysics();

    initKeys();


}

当调用以下代码时：

@Override
public void simpleUpdate(float tpf) {
    //Update ship heading
    shipHeading = shipHeading.mult(shipRotationMoment);
    shipNode.setLocalRotation(shipHeading);

    shipPos = shipPos.add(shipVelocity);
    shipNode.setLocalTranslation(shipPos);
}

盒子会像预测的那样移动，但是相机会停留在原来的位置。图表应该是这样的：

• shipBase
• cameraNode

• rootNode
  • b (Box)
  • shipNode

​

​

因此，相机应该已经绑定到shipNode。我遗漏了什么？

Answer 1

阅读您提供的教程，似乎您可能有一个错误。你有：

cameraNode.setControlDir(ControlDirection.CameraToSpatial);

然而，本教程有：

//This mode means that camera copies the movements of the target:
camNode.setControlDir(ControlDirection.SpatialToCamera);

在本教程的较低部分，它定义了这2 ControlDirections之间的区别。本教程提供的是照相机跟踪物体的运动，而你拥有的物体跟随相机的运动。

希望这能有所帮助。