为什么我的角色要么在地板上盘旋呢？

Question

我正在制作一个带有角色和地板的简单3D场景，但是如果我将y坐标设置为负数，则角色会在场景中徘徊或落下。

private void createCharacters() {
    CapsuleCollisionShape capsule = new CapsuleCollisionShape(3f, 4f);
    character = new CharacterControl(capsule, 0.01f);
    model = (Node) assetManager.loadModel("Models/Ninja/Ninja.mesh.xml");
    float scale = 0.25f;
    model.scale(0.05f, 0.05f, 0.05f);
    model.addControl(character);
    character.setPhysicsLocation(new Vector3f(0, -0.15f, 0));
    model.setShadowMode(ShadowMode.CastAndReceive);
    character.setViewDirection(new Vector3f(1, 0, 0));
    rootNode.attachChild(model);
    getPhysicsSpace().add(character);

}

上面的代码使角色落在场景中。稍微更改它会使角色悬停：

character.setPhysicsLocation(new Vector3f(0, -0.09f, 0));

如果你想检查它在这里的所有代码

package adventure;

import java.applet.Applet;
import com.jme3.math.Quaternion;
import com.jme3.math.FastMath;
import java.applet.AudioClip;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.TextArea;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import com.jme3.material.RenderState.FaceCullMode;
import javax.swing.JFrame;
import javax.swing.JPanel;
import com.jme3.renderer.queue.RenderQueue.ShadowMode;
import com.jme3.animation.AnimChannel;
import com.jme3.animation.AnimControl;
import com.jme3.animation.AnimEventListener;
import com.jme3.animation.LoopMode;
import com.jme3.app.SimpleApplication;
import com.jme3.asset.BlenderKey;
import com.jme3.asset.TextureKey;
import com.jme3.asset.plugins.ZipLocator;
import com.jme3.bullet.BulletAppState;
import com.jme3.bullet.PhysicsSpace;
import com.jme3.bullet.collision.PhysicsCollisionEvent;
import com.jme3.bullet.collision.PhysicsCollisionListener;
import com.jme3.bullet.collision.shapes.CapsuleCollisionShape;
import com.jme3.bullet.collision.shapes.CollisionShape;
import com.jme3.bullet.collision.shapes.SphereCollisionShape;
import com.jme3.bullet.control.CharacterControl;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.bullet.util.CollisionShapeFactory;
import com.jme3.effect.ParticleEmitter;
import com.jme3.effect.ParticleMesh.Type;
import com.jme3.effect.shapes.EmitterSphereShape;
import com.jme3.input.ChaseCamera;
import com.jme3.input.KeyInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.light.DirectionalLight;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector2f;
import com.jme3.math.Vector3f;
import com.jme3.post.FilterPostProcessor;
import com.jme3.post.filters.BloomFilter;
import com.jme3.renderer.Camera;
import com.jme3.renderer.queue.RenderQueue.ShadowMode;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.Spatial;
import com.jme3.scene.shape.Box;
import com.jme3.scene.shape.Sphere;
import com.jme3.scene.shape.Sphere.TextureMode;
import com.jme3.system.AppSettings;
import com.jme3.system.JmeCanvasContext;
import com.jme3.terrain.geomipmap.TerrainLodControl;
import com.jme3.terrain.geomipmap.TerrainQuad;
import com.jme3.terrain.heightmap.AbstractHeightMap;
import com.jme3.terrain.heightmap.ImageBasedHeightMap;
import com.jme3.texture.Texture;
import com.jme3.texture.Texture.WrapMode;
import com.jme3.util.SkyFactory;

public class MountainWorld extends SimpleApplication implements ActionListener,
        PhysicsCollisionListener, AnimEventListener, Playable {






      /** Prepare Materials */
      Material wall_mat;
      Material stone_mat;
      Material floor_mat;

      /** Prepare geometries and physical nodes for bricks and cannon balls. */
      private RigidBodyControl    brick_phy;
      private static final Box    box;
      private RigidBodyControl    ball_phy;
      private static final Sphere sphere;
      private RigidBodyControl    floor_phy;
      private static final Box    floor;

      /** dimensions used for bricks and wall */
      private static final float brickLength = 0.48f;
      private static final float brickWidth  = 0.24f;
      private static final float brickHeight = 0.12f;

      static {
        /** Initialize the cannon ball geometry */
        sphere = new Sphere(32, 32, 0.4f, true, false);
        sphere.setTextureMode(TextureMode.Projected);
        /** Initialize the brick geometry */
        box = new Box(Vector3f.ZERO, brickLength, brickHeight, brickWidth);
        box.scaleTextureCoordinates(new Vector2f(1f, .5f));
        /** Initialize the floor geometry */
        floor = new Box(Vector3f.ZERO, 10f, 0.1f, 5f);
        floor.scaleTextureCoordinates(new Vector2f(3, 6));
      }







    private static World world;
    private static Person person;
    private static Player dplayer;
    private static TextArea textarea;
    private BulletAppState bulletAppState;
    private AnimChannel channel;
    private AnimControl control;
    // character
    CharacterControl character;
    Node model;
    // temp vectors
    Vector3f walkDirection = new Vector3f();
    // terrain
    TerrainQuad terrain;
    RigidBodyControl terrainPhysicsNode;
    // Materials
    Material matRock;
    Material matBullet;
    // animation
    AnimChannel animationChannel;
    AnimChannel shootingChannel;
    AnimControl animationControl;
    float airTime = 0;
    // camera
    boolean left = false, right = false, up = false, down = false;
    ChaseCamera chaseCam;
    // bullet
    Sphere bullet;
    SphereCollisionShape bulletCollisionShape;
    // explosion
    ParticleEmitter effect;
    // brick wall
    Box brick;
    float bLength = 0.8f;
    float bWidth = 0.4f;
    float bHeight = 0.4f;
    FilterPostProcessor fpp;
    private Spatial sceneModel;

    private RigidBodyControl landscape;
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                AppSettings settings = new AppSettings(true);
                settings.setWidth(850);
                settings.setHeight(440);

                MountainWorld canvasApplication = new MountainWorld();
                canvasApplication.setSettings(settings);
                canvasApplication.createCanvas(); // create canvas!
                JmeCanvasContext ctx = (JmeCanvasContext) canvasApplication
                        .getContext();
                ctx.setSystemListener(canvasApplication);
                Dimension dim = new Dimension(640, 480);
                ctx.getCanvas().setPreferredSize(dim);

                JFrame window = new JFrame("Mountain World");
                window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                JPanel panel = new JPanel(new BorderLayout()); // a panel
                world = new DungeonWorld(canvasApplication);
                person = new Person(world, "You", null);
                dplayer = new Player(world, person);
                Commands commands = new Commands(person);
                textarea = new TextArea("", 10, 60,
                        TextArea.SCROLLBARS_VERTICAL_ONLY);
                textarea.append("You are in a mountain. The trolls live here.\n");
                textarea.setEditable(false);
                panel.add("West", ctx.getCanvas());
                panel.add("East", commands);
                panel.add("South", textarea);
                window.add(panel);
                window.pack();
                window.setVisible(true);
                canvasApplication.startCanvas();

            }
        });
    }

    @Override
    public void simpleInitApp() {
        bulletAppState = new BulletAppState();
        bulletAppState.setThreadingType(BulletAppState.ThreadingType.PARALLEL);
        stateManager.attach(bulletAppState);
        setupKeys();
        //prepareBullet();
        //prepareEffect();
        createLight();
        //createSky();
        initMaterials();
        initFloor();
        //createTerrain();
        //createWall();
        createCharacters();
        setupChaseCamera();
        setupAnimationController();
        setupFilter();
    }
     /** Make a solid floor and add it to the scene. */
      public void initFloor() {
        Geometry floor_geo = new Geometry("Floor", floor);
        floor_geo.setMaterial(floor_mat);
        floor_geo.setLocalTranslation(0, -0.1f, 0);
        this.rootNode.attachChild(floor_geo);
        /* Make the floor physical with mass 0.0f! */
        floor_phy = new RigidBodyControl(0.0f);
        floor_geo.addControl(floor_phy);
        bulletAppState.getPhysicsSpace().add(floor_phy);
      }

      /** Initialize the materials used in this scene. */
      public void initMaterials() {
        wall_mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        TextureKey key = new TextureKey("Textures/Terrain/BrickWall/BrickWall.jpg");
        key.setGenerateMips(true);
        Texture tex = assetManager.loadTexture(key);
        wall_mat.setTexture("ColorMap", tex);

        stone_mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        TextureKey key2 = new TextureKey("Textures/Terrain/Rock/Rock.PNG");
        key2.setGenerateMips(true);
        Texture tex2 = assetManager.loadTexture(key2);
        stone_mat.setTexture("ColorMap", tex2);

        floor_mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        TextureKey key3 = new TextureKey("Textures/Terrain/Pond/Pond.jpg");
        key3.setGenerateMips(true);
        Texture tex3 = assetManager.loadTexture(key3);
        tex3.setWrap(WrapMode.Repeat);
        floor_mat.setTexture("ColorMap", tex3);
      }


    private void setupFilter() {
        FilterPostProcessor fpp = new FilterPostProcessor(assetManager);
        BloomFilter bloom = new BloomFilter(BloomFilter.GlowMode.Objects);
        fpp.addFilter(bloom);
        viewPort.addProcessor(fpp);
    }

    private PhysicsSpace getPhysicsSpace() {
        return bulletAppState.getPhysicsSpace();
    }

    private void setupKeys() {
        inputManager.addMapping("wireframe", new KeyTrigger(KeyInput.KEY_T));
        inputManager.addListener(this, "wireframe");
        inputManager.addMapping("CharLeft", new KeyTrigger(KeyInput.KEY_A));
        inputManager.addMapping("CharRight", new KeyTrigger(KeyInput.KEY_D));
        inputManager.addMapping("CharUp", new KeyTrigger(KeyInput.KEY_W));
        inputManager.addMapping("CharDown", new KeyTrigger(KeyInput.KEY_S));
        inputManager.addMapping("CharSpace",
                new KeyTrigger(KeyInput.KEY_RETURN));
        inputManager
                .addMapping("CharShoot", new KeyTrigger(KeyInput.KEY_SPACE));
        inputManager.addListener(this, "CharLeft");
        inputManager.addListener(this, "CharRight");
        inputManager.addListener(this, "CharUp");
        inputManager.addListener(this, "CharDown");
        inputManager.addListener(this, "CharSpace");
        inputManager.addListener(this, "CharShoot");
    }

    private void createWall() {
        float xOff = -144;
        float zOff = -40;
        float startpt = bLength / 4 - xOff;
        float height = 6.1f;
        brick = new Box(Vector3f.ZERO, bLength, bHeight, bWidth);
        brick.scaleTextureCoordinates(new Vector2f(1f, .5f));
        for (int j = 0; j < 15; j++) {
            for (int i = 0; i < 4; i++) {
                Vector3f vt = new Vector3f(i * bLength * 2 + startpt, bHeight
                        + height, zOff);
                addBrick(vt);
            }
            startpt = -startpt;
            height += 1.01f * bHeight;
        }
    }

    private void addBrick(Vector3f ori) {
        Geometry reBoxg = new Geometry("brick", brick);
        reBoxg.setMaterial(matBullet);
        reBoxg.setLocalTranslation(ori);
        reBoxg.addControl(new RigidBodyControl(1.5f));
        reBoxg.setShadowMode(ShadowMode.CastAndReceive);
        this.rootNode.attachChild(reBoxg);
        this.getPhysicsSpace().add(reBoxg);
    }

    private void prepareBullet() {
        bullet = new Sphere(32, 32, 0.4f, true, false);
        bullet.setTextureMode(TextureMode.Projected);
        bulletCollisionShape = new SphereCollisionShape(0.4f);
        matBullet = new Material(getAssetManager(),
                "Common/MatDefs/Misc/Unshaded.j3md");
        matBullet.setColor("Color", ColorRGBA.Green);
        // matBullet.setColor("m_GlowColor", ColorRGBA.Green);
        getPhysicsSpace().addCollisionListener(this);
    }

    private void prepareEffect() {
        int COUNT_FACTOR = 1;
        float COUNT_FACTOR_F = 1f;
        effect = new ParticleEmitter("Flame", Type.Triangle, 32 * COUNT_FACTOR);
        effect.setSelectRandomImage(true);
        effect.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f,
                (float) (1f / COUNT_FACTOR_F)));
        effect.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
        effect.setStartSize(1.3f);
        effect.setEndSize(2f);
        effect.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
        effect.setParticlesPerSec(0);
        effect.setGravity(0, -5, 0);
        effect.setLowLife(.4f);
        effect.setHighLife(.5f);
        effect.setInitialVelocity(new Vector3f(0, 7, 0));
        effect.setVelocityVariation(1f);
        effect.setImagesX(2);
        effect.setImagesY(2);
        Material mat = new Material(assetManager,
                "Common/MatDefs/Misc/Particle.j3md");
        mat.setTexture("Texture",
                assetManager.loadTexture("Effects/Explosion/flame.png"));
        effect.setMaterial(mat);
        // effect.setLocalScale(100);
        rootNode.attachChild(effect);
    }

    private void createLight() {
        Vector3f direction = new Vector3f(-0.1f, -0.7f, -1).normalizeLocal();
        DirectionalLight dl = new DirectionalLight();
        dl.setDirection(direction);
        dl.setColor(new ColorRGBA(1f, 1f, 1f, 1.0f));
        rootNode.addLight(dl);
    }

    private void createSky() {
        rootNode.attachChild(SkyFactory.createSky(assetManager,
                "Textures/Sky/Bright/BrightSky.dds", false));
    }

    private void createTerrain2() {
        matRock = new Material(assetManager,
                "Common/MatDefs/Terrain/TerrainLighting.j3md");
        matRock.setBoolean("useTriPlanarMapping", false);
        matRock.setBoolean("WardIso", true);
        matRock.setTexture("AlphaMap",
                assetManager.loadTexture("Textures/Terrain/splat/alphamap.png"));
        Texture heightMapImage = assetManager
                .loadTexture("Textures/Terrain/splat/mountains512.png");
        Texture grass = assetManager
                .loadTexture("Textures/Terrain/splat/grass.jpg");
        grass.setWrap(WrapMode.Repeat);
        matRock.setTexture("DiffuseMap", grass);
        matRock.setFloat("DiffuseMap_0_scale", 64);
        Texture dirt = assetManager
                .loadTexture("Textures/Terrain/splat/dirt.jpg");
        dirt.setWrap(WrapMode.Repeat);
        matRock.setTexture("DiffuseMap_1", dirt);
        matRock.setFloat("DiffuseMap_1_scale", 16);
        Texture rock = assetManager
                .loadTexture("Textures/Terrain/splat/road.jpg");
        rock.setWrap(WrapMode.Repeat);
        matRock.setTexture("DiffuseMap_2", rock);
        matRock.setFloat("DiffuseMap_2_scale", 128);
        Texture normalMap0 = assetManager
                .loadTexture("Textures/Terrain/splat/grass_normal.jpg");
        normalMap0.setWrap(WrapMode.Repeat);
        Texture normalMap1 = assetManager
                .loadTexture("Textures/Terrain/splat/dirt_normal.png");
        normalMap1.setWrap(WrapMode.Repeat);
        Texture normalMap2 = assetManager
                .loadTexture("Textures/Terrain/splat/road_normal.png");
        normalMap2.setWrap(WrapMode.Repeat);
        matRock.setTexture("NormalMap", normalMap0);
        matRock.setTexture("NormalMap_1", normalMap2);
        matRock.setTexture("NormalMap_2", normalMap2);

        AbstractHeightMap heightmap = null;
        try {
            heightmap = new ImageBasedHeightMap(heightMapImage.getImage(),
                    0.25f);
            heightmap.load();

        } catch (Exception e) {
            e.printStackTrace();
        }

        terrain = new TerrainQuad("terrain", 65, 513, heightmap.getHeightMap());
        List<Camera> cameras = new ArrayList<Camera>();
        cameras.add(getCamera());
        TerrainLodControl control = new TerrainLodControl(terrain, cameras);
        terrain.addControl(control);
        terrain.setMaterial(matRock);
        terrain.setLocalScale(new Vector3f(2, 2, 2));

        terrainPhysicsNode = new RigidBodyControl(
                CollisionShapeFactory.createMeshShape(terrain), 0);
        terrain.addControl(terrainPhysicsNode);
        rootNode.attachChild(terrain);
        getPhysicsSpace().add(terrainPhysicsNode);
    }

    private void createTerrain() {


         assetManager.registerLocator("town.zip", ZipLocator.class);
         sceneModel = assetManager.loadModel("main.scene");
        //sceneModel = assetManager.loadModel("Scenes/ManyLights/Main.scene");
        sceneModel.setLocalScale(2f);
        //initFloor();
        // We set up collision detection for the scene by creating a
        // compound collision shape and a static RigidBodyControl with mass
        // zero.
        CollisionShape sceneShape = CollisionShapeFactory
                .createMeshShape((Node) sceneModel);
        landscape = new RigidBodyControl(sceneShape, 0);
        sceneModel.addControl(landscape);
        List<Camera> cameras = new ArrayList<Camera>();
        cameras.add(getCamera());
        rootNode.attachChild(sceneModel);
    }

    private void createCharacters() {
        CapsuleCollisionShape capsule = new CapsuleCollisionShape(3f, 4f);
        character = new CharacterControl(capsule, 0.01f);
        model = (Node) assetManager.loadModel("Models/Ninja/Ninja.mesh.xml");
        float scale = 0.25f;
        model.scale(0.05f, 0.05f, 0.05f);
        model.addControl(character);
        character.setPhysicsLocation(new Vector3f(0, -0.09f, 0));
        model.setShadowMode(ShadowMode.CastAndReceive);
        character.setViewDirection(new Vector3f(1, 0, 0));
        rootNode.attachChild(model);
        getPhysicsSpace().add(character);

        //BlenderKey blenderKey = new BlenderKey("Models/Oto/Oto.mesh.xml");

        //Spatial man = (Spatial) assetManager.loadModel(blenderKey);
        //man.setLocalTranslation(new Vector3f(-140, 12.5f, -10));

        // man.setShadowMode(ShadowMode.CastAndReceive);
        //rootNode.attachChild(man);

    }

    private void setupChaseCamera() {
        flyCam.setEnabled(false);
        chaseCam = new ChaseCamera(cam, model, inputManager);
    }

    private void setupAnimationController() {
        animationControl = model.getControl(AnimControl.class);
        animationControl.addListener(this);
        animationChannel = animationControl.createChannel();
        // shootingChannel = animationControl.createChannel();
        // shootingChannel.addBone(animationControl.getSkeleton().getBone(
        // "uparm.right"));
        // shootingChannel.addBone(animationControl.getSkeleton().getBone(
        // "arm.right"));
        // shootingChannel.addBone(animationControl.getSkeleton().getBone(
        // "hand.right"));
    }

    @Override
    public void simpleUpdate(float tpf) {
        Vector3f camDir = cam.getDirection().clone().multLocal(0.1f);
        Vector3f camLeft = cam.getLeft().clone().multLocal(0.1f);
        camDir.y = 0;
        camLeft.y = 0;
        walkDirection.set(0, 0, 0);
        if (left) {
            walkDirection.addLocal(camLeft);
        }
        if (right) {
            walkDirection.addLocal(camLeft.negate());
        }
        if (up) {
            walkDirection.addLocal(camDir);
        }
        if (down) {
            walkDirection.addLocal(camDir.negate());
        }
        if (!character.onGround()) {
            airTime = airTime + tpf;
        } else {
            airTime = 0;
        }
        if (walkDirection.length() == 0) {
            if (!"Idle1".equals(animationChannel.getAnimationName())) {
                animationChannel.setAnim("Idle1", 1f);
            }
        } else {
            character.setViewDirection(walkDirection);
            if (airTime > .3f) {
                if (!"stand".equals(animationChannel.getAnimationName())) {
                    animationChannel.setAnim("stand");
                }
            } else if (!"Walk".equals(animationChannel.getAnimationName())) {
                animationChannel.setAnim("Walk", 0.7f);
            }
        }
        character.setWalkDirection(walkDirection);
    }

    public void onAction(String binding, boolean value, float tpf) {
        if (binding.equals("CharLeft")) {
            if (value) {
                left = true;
            } else {
                left = false;
            }
        } else if (binding.equals("CharRight")) {
            if (value) {
                right = true;
            } else {
                right = false;
            }
        } else if (binding.equals("CharUp")) {
            if (value) {
                up = true;
            } else {
                up = false;
            }
        } else if (binding.equals("CharDown")) {
            if (value) {
                down = true;
            } else {
                down = false;
            }
        } else if (binding.equals("CharSpace")) {
            character.jump();
        } else if (binding.equals("CharShoot") && !value) {
            bulletControl();
        }
    }

    private void bulletControl() {
        shootingChannel.setAnim("Dodge", 0.1f);
        shootingChannel.setLoopMode(LoopMode.DontLoop);
        Geometry bulletg = new Geometry("bullet", bullet);
        bulletg.setMaterial(matBullet);
        bulletg.setShadowMode(ShadowMode.CastAndReceive);
        bulletg.setLocalTranslation(character.getPhysicsLocation().add(
                cam.getDirection().mult(5)));
        RigidBodyControl bulletControl = new BombControl(bulletCollisionShape,
                1);
        bulletControl.setCcdMotionThreshold(0.1f);
        bulletControl.setLinearVelocity(cam.getDirection().mult(80));
        bulletg.addControl(bulletControl);
        rootNode.attachChild(bulletg);
        getPhysicsSpace().add(bulletControl);
    }

    public void collision(PhysicsCollisionEvent event) {
        if (event.getObjectA() instanceof BombControl) {
            final Spatial node = event.getNodeA();
            effect.killAllParticles();
            effect.setLocalTranslation(node.getLocalTranslation());
            effect.emitAllParticles();
        } else if (event.getObjectB() instanceof BombControl) {
            final Spatial node = event.getNodeB();
            effect.killAllParticles();
            effect.setLocalTranslation(node.getLocalTranslation());
            effect.emitAllParticles();
        }
    }

    public void onAnimCycleDone(AnimControl control, AnimChannel channel,
            String animName) {
        if (channel == shootingChannel) {
            channel.setAnim("stand");
        }
    }

    public void onAnimChange(AnimControl control, AnimChannel channel,
            String animName) {
    }

    // Load an image from the net, making sure it has already been
    // loaded when the method returns
    public Image loadPicture(String imageName) {
        return null;
    }

    // Load and play a sound from /usr/local/hacks/sounds/

    public void playSound(String name) {
        URL u = null;

        try {
            u = new URL("file:" + "/usr/local/hacks/sounds/" + name + ".au");
        } catch (MalformedURLException e) {
        }

        AudioClip a = Applet.newAudioClip(u);
        a.play();
    }
}

Answer 1

这似乎是由于这行代码所致：

CapsuleCollisionShape capsule = new CapsuleCollisionShape(3f, 4f);

然后你缩小模型。我不知道传入的值是什么，但我想一个是半径，另一个是高度，尝试向下移动3f，将4f移到更低的位置，如1.0f和2.0f。

碰撞检测似乎是向上推动你的角色，因为它的碰撞形状是一个胶囊，它的大小与模型不同，模型放在胶囊的中间。