【发布时间】：2014-01-08 12:52:52
【问题描述】：
我得到了一个 3D 宇宙飞船，它在 3D 场景中正确地向前和向后移动，但向右和向左的移动不正确，而且 A 和 D 按钮的作用似乎随相机位置而变化。这是适用于按钮 W（前进）和 S（后退）的侦听器代码，而按钮 A 和 D 并没有完全做到它们应该做的事情。
当我开始 3D 空间场景时，飞船的转向正在工作，按钮 A 和 D 左右移动飞船，但是在更改相机并旋转视图后，按钮 A 和 D 仍然是相反的方向，但是不是左右，而是取决于相机的位置。
public void onAnalog(String name, float value, float tpf) {
// computing the normalized direction of the cam to move the node
int movement = 80000;
int rotation = 1;
direction.set(cam.getDirection()).normalizeLocal();
if (name.equals("moveForward")) {
direction.multLocal(movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveBackward")) {
direction.multLocal(-movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveRight")) {
direction.crossLocal(Vector3f.UNIT_Y).multLocal(movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveLeft")) {
direction.crossLocal(Vector3f.UNIT_Y).multLocal(-movement * tpf);
ufoNode.move(direction);
}
if (name.equals("rotateRight") && rotate) {
ufoNode.rotate(0, 1 * tpf, 0);
}
if (name.equals("rotateLeft") && rotate) {
ufoNode.rotate(0, -1 * tpf, 0);
}
if (name.equals("rotateUp") && rotate) {
ufoNode.rotate(0, 0, -1 * tpf);
}
if (name.equals("rotateDown") && rotate) {
ufoNode.rotate(0, 0, 1 * tpf);
}
}
你能帮我告诉我应该怎么做才能修复左右运动吗？整个代码是
public class SpaceStation extends SimpleApplication implements AnalogListener,
ActionListener {
private PlanetAppState planetAppState;
private Geometry mark;
private Node ufoNode;
private Node spaceStationNode;
private Node jumpgateNode;
private Node jumpgateNode2;
private BetterCharacterControl ufoControl;
CameraNode camNode;
boolean rotate = false;
Vector3f direction = new Vector3f();
private BulletAppState bulletAppState;
public static void main(String[] args) {
AppSettings settings = new AppSettings(true);
settings.setResolution(1024, 768);
SpaceStation app = new SpaceStation();
app.setSettings(settings);
// app.showSettings = true;
app.start();
}
@Override
public void simpleInitApp() {
// Only show severe errors in log
java.util.logging.Logger.getLogger("com.jme3").setLevel(
java.util.logging.Level.SEVERE);
bulletAppState = new BulletAppState();
bulletAppState.setThreadingType(BulletAppState.ThreadingType.PARALLEL);
stateManager.attach(bulletAppState);
bulletAppState.setDebugEnabled(false);
DirectionalLight sun = new DirectionalLight();
sun.setDirection(new Vector3f(-.1f, 0f, -1f));
sun.setColor(new ColorRGBA(0.75f, 0.75f, 0.75f, 1.0f));
rootNode.addLight(sun);
// Add sky
Node sceneNode = new Node("Scene");
sceneNode.attachChild(Utility.createSkyBox(this.getAssetManager(),
"Textures/blue-glow-1024.dds"));
rootNode.attachChild(sceneNode);
// Create collision test mark
Sphere sphere = new Sphere(30, 30, 5f);
mark = new Geometry("mark", sphere);
Material mark_mat = new Material(assetManager,
"Common/MatDefs/Misc/Unshaded.j3md");
mark_mat.setColor("Color", ColorRGBA.Red);
mark.setMaterial(mark_mat);
// Add planet app state
planetAppState = new PlanetAppState(rootNode, sun);
stateManager.attach(planetAppState);
// Add planet
FractalDataSource planetDataSource = new FractalDataSource(4);
planetDataSource.setHeightScale(900f);
Planet planet = Utility.createEarthLikePlanet(getAssetManager(),
293710.0f, null, planetDataSource);
planetAppState.addPlanet(planet);
rootNode.attachChild(planet);
// Add moon
FractalDataSource moonDataSource = new FractalDataSource(5);
moonDataSource.setHeightScale(300f);
Planet moon = Utility.createMoonLikePlanet(getAssetManager(), 50000,
moonDataSource);
planetAppState.addPlanet(moon);
rootNode.attachChild(moon);
moon.setLocalTranslation(new Vector3f(10f, 10f, 505000f));//-950000f, 0f, 0f);
// add saucer
ufoNode = (Node) assetManager.loadModel("usaucer_v01.j3o");
ufoNode.setLocalScale(100f);
ufoNode.setLocalTranslation((new Vector3f(1000f, -1000f, 328000f)));
jumpgateNode = (Node) assetManager.loadModel("JumpGate.j3o");
jumpgateNode.setLocalScale(10000f);
jumpgateNode.setLocalTranslation((new Vector3f(10f, 10f, 708000f)));
spaceStationNode = (Node) assetManager.loadModel("SpaceStation.j3o");
spaceStationNode.setLocalScale(4000f);
spaceStationNode.setLocalTranslation((new Vector3f(10000f, -10f, 425000f)));
jumpgateNode2 = (Node) assetManager.loadModel("JumpGate.j3o");
jumpgateNode2.setLocalScale(10000f);
jumpgateNode2.setLocalTranslation((new Vector3f(10f, 10f, 798300f)));
/* This quaternion stores a 180 degree rolling rotation */
// Quaternion roll180 = new Quaternion();
// roll180.fromAngleAxis(FastMath.PI, new Vector3f(0, 0, 1));
/* The rotation is applied: The object rolls by 180 degrees. */
// ufoNode.setLocalRotation(roll180);
rootNode.attachChild(jumpgateNode);
rootNode.attachChild(jumpgateNode2);
rootNode.attachChild(spaceStationNode);
// creating the camera Node
camNode = new CameraNode("CamNode", cam);
// Setting the direction to Spatial to camera, this means the camera
// will copy the movements of the Node
camNode.setControlDir(ControlDirection.SpatialToCamera);
// attaching the camNode to the teaNode
ufoNode.attachChild(camNode);
// setting the local translation of the cam node to move it away a bit
camNode.setLocalTranslation(new Vector3f(-40, 0, 0));
// setting the camNode to look at the teaNode
camNode.lookAt(ufoNode.getLocalTranslation(), Vector3f.UNIT_Y);
// disable the default 1st-person flyCam (don't forget this!!)
ufoControl = new BetterCharacterControl(100000f, 80000f, 5000f);// (2, 4, 0.5f);
// radius (meters), height (meters), gravity (mass)
//ufoNode.addControl(ufoControl);
//rootNode.attachChild(ninjaNode);
//bulletAppState.getPhysicsSpace().add(ufoControl);
//getPhysicsSpace().add(ufoControl);
rootNode.attachChild(ufoNode);
flyCam.setEnabled(false);
registerInput();
}
private PhysicsSpace getPhysicsSpace() {
return bulletAppState.getPhysicsSpace();
}
public void registerInput() {
inputManager.addMapping("moveForward", new KeyTrigger(keyInput.KEY_UP),
new KeyTrigger(keyInput.KEY_W));
inputManager.addMapping("moveBackward", new KeyTrigger(
keyInput.KEY_DOWN), new KeyTrigger(keyInput.KEY_S));
inputManager.addMapping("moveRight",
new KeyTrigger(keyInput.KEY_RIGHT), new KeyTrigger(
keyInput.KEY_D));
inputManager.addMapping("moveLeft", new KeyTrigger(keyInput.KEY_LEFT),
new KeyTrigger(keyInput.KEY_A));
inputManager.addMapping("toggleRotate", new MouseButtonTrigger(
MouseInput.BUTTON_LEFT));
inputManager.addMapping("rotateRight", new MouseAxisTrigger(
MouseInput.AXIS_X, true));
inputManager.addMapping("rotateLeft", new MouseAxisTrigger(
MouseInput.AXIS_X, false));
inputManager.addMapping("rotateUp", new MouseAxisTrigger(
MouseInput.AXIS_Y, true));
inputManager.addMapping("rotateDown", new MouseAxisTrigger(
MouseInput.AXIS_Y, false));
inputManager.addListener(this, "moveForward", "moveBackward",
"moveRight", "moveLeft");
inputManager.addListener(this, "rotateRight", "rotateLeft", "rotateUp",
"rotateDown", "toggleRotate");
// Toggle mouse cursor
inputManager.addMapping("TOGGLE_CURSOR", new MouseButtonTrigger(
MouseInput.BUTTON_LEFT), new KeyTrigger(KeyInput.KEY_SPACE));
inputManager.addListener(actionListener, "TOGGLE_CURSOR");
// Toggle wireframe
inputManager.addMapping("TOGGLE_WIREFRAME", new KeyTrigger(
KeyInput.KEY_T));
inputManager.addListener(actionListener, "TOGGLE_WIREFRAME");
// Collision test
inputManager.addMapping("COLLISION_TEST", new MouseButtonTrigger(
MouseInput.BUTTON_RIGHT));
inputManager.addListener(actionListener, "COLLISION_TEST");
}
public void onAnalog(String name, float value, float tpf) {
// computing the normalized direction of the cam to move the node
int movement = 80000;
int rotation = 1;
direction.set(cam.getDirection()).normalizeLocal();
if (name.equals("moveForward")) {
direction.multLocal(movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveBackward")) {
direction.multLocal(-movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveRight")) {
direction.crossLocal(Vector3f.UNIT_Y).multLocal(movement * tpf);
ufoNode.move(direction);
}
if (name.equals("moveLeft")) {
direction.crossLocal(Vector3f.UNIT_Y).multLocal(-movement * tpf);
ufoNode.move(direction);
}
if (name.equals("rotateRight") && rotate) {
ufoNode.rotate(0, 1 * tpf, 0);
}
if (name.equals("rotateLeft") && rotate) {
ufoNode.rotate(0, -1 * tpf, 0);
}
if (name.equals("rotateUp") && rotate) {
ufoNode.rotate(0, 0, -1 * tpf);
}
if (name.equals("rotateDown") && rotate) {
ufoNode.rotate(0, 0, 1 * tpf);
}
}
public void onAction(String name, boolean keyPressed, float tpf) {
// toggling rotation on or off
if (name.equals("toggleRotate") && keyPressed) {
rotate = true;
inputManager.setCursorVisible(false);
}
if (name.equals("toggleRotate") && !keyPressed) {
rotate = false;
inputManager.setCursorVisible(true);
}
if (name.equals("TOGGLE_CURSOR") && !keyPressed) {
if (inputManager.isCursorVisible()) {
inputManager.setCursorVisible(false);
} else {
inputManager.setCursorVisible(true);
}
}
if (name.equals("TOGGLE_WIREFRAME") && !keyPressed) {
for (Planet planet : planetAppState.getPlanets()) {
planet.toogleWireframe();
}
}
if (name.equals("COLLISION_TEST") && !keyPressed) {
CollisionResults results = new CollisionResults();
Ray ray = new Ray(cam.getLocation(), cam.getDirection());
// Test collision with closest planet's terrain only
planetAppState.getNearestPlanet().getTerrainNode()
.collideWith(ray, results);
System.out.println("----- Collisions? " + results.size() + "-----");
for (int i = 0; i < results.size(); i++) {
// For each hit, we know distance, impact point, name of
// geometry.
float dist = results.getCollision(i).getDistance();
Vector3f pt = results.getCollision(i).getContactPoint();
String hit = results.getCollision(i).getGeometry().getName();
System.out.println("* Collision #" + i);
System.out.println(" You shot " + hit + " at " + pt + ", "
+ dist + " wu away.");
}
if (results.size() > 0) {
// The closest collision point is what was truly hit:
CollisionResult closest = results.getClosestCollision();
// Let's interact - we mark the hit with a red dot.
mark.setLocalTranslation(closest.getContactPoint());
rootNode.attachChild(mark);
} else {
// No hits? Then remove the red mark.
rootNode.detachChild(mark);
}
}
}
private ActionListener actionListener = new ActionListener() {
public void onAction(String name, boolean pressed, float tpf) {
if (name.equals("TOGGLE_CURSOR") && !pressed) {
if (inputManager.isCursorVisible()) {
inputManager.setCursorVisible(false);
} else {
inputManager.setCursorVisible(true);
}
}
if (name.equals("TOGGLE_WIREFRAME") && !pressed) {
for (Planet planet : planetAppState.getPlanets()) {
planet.toogleWireframe();
}
}
if (name.equals("COLLISION_TEST") && !pressed) {
CollisionResults results = new CollisionResults();
Ray ray = new Ray(cam.getLocation(), cam.getDirection());
// Test collision with closest planet's terrain only
planetAppState.getNearestPlanet().getTerrainNode()
.collideWith(ray, results);
System.out.println("----- Collisions? " + results.size()
+ "-----");
for (int i = 0; i < results.size(); i++) {
// For each hit, we know distance, impact point, name of
// geometry.
float dist = results.getCollision(i).getDistance();
Vector3f pt = results.getCollision(i).getContactPoint();
String hit = results.getCollision(i).getGeometry()
.getName();
System.out.println("* Collision #" + i);
System.out.println(" You shot " + hit + " at " + pt + ", "
+ dist + " wu away.");
}
if (results.size() > 0) {
// The closest collision point is what was truly hit:
CollisionResult closest = results.getClosestCollision();
// Let's interact - we mark the hit with a red dot.
mark.setLocalTranslation(closest.getContactPoint());
rootNode.attachChild(mark);
} else {
// No hits? Then remove the red mark.
rootNode.detachChild(mark);
}
}
}
};
}
【问题讨论】：
-
在您的方法中：public void onAnalog(String name, float value, float tpf)，将“cam”更改为“camNode”是否正确？在您的完整代码中，我看不到 cam 是可访问的。
-
@MaineCoder 我认为
cam可能是从基类继承的。使用它没有错误，它可以向前和向后移动。如果您喜欢我的项目，可以查看 sourceforge.net/projects/spaceworld/ -
为什么左右有crossLocal和multLocal，前进后退只有multLocal？
-
我觉得 .crossLocal(Vector3f.UNIT_Y) 在这里引起了问题，因为您是从 Vector3f 类而不是类的实例调用 UNIT_Y...
-
@MaineCoder 它在开始时有效，但在我旋转相机后无效。我可能应该使用
crossLocal，但我不知道在那里使用哪个 Vector。你知道哪个 Vector 应该是 crossLocal 的参数吗？因为它在我移动相机之前就开始工作了，所以我可能需要来自相机的矢量，并且矢量与 UFO 的移动矢量相同。
标签： java 3d game-physics jmonkeyengine