Body在设置maskbit和category后仍然检测到碰撞

Question

我已经设置了我身体的maskbits和categorybits。但是为什么在不应该被检测到的物体之间仍然检测到碰撞？

身体1：

    BodyDef def = new BodyDef();
    FixtureDef fixtureDef = new FixtureDef();

    def.type = BodyDef.BodyType.DynamicBody;
    def.position.set( 5, 2);

    CircleShape circleShape = new CircleShape();
    circleShape.setRadius(getWidth() /GC.UNITS_PER_METER /7);

    fixtureDef.shape = circleShape;
    fixtureDef.density = 1f;
    fixtureDef.friction = 1;
    fixtureDef.filter.categoryBits = GC.CATEGORY_MONSTER_MOUTH;
    fixtureDef.filter.maskBits = GC.MASK_MONSTER_MOUTH;

    Body box = world.createBody(def);
    box.createFixture(fixtureDef);
    circleShape.dispose();

    sensorBody= box;
    sensorBody.setFixedRotation(true);
    sensorBody.setAwake(true);
    sensorBody.setUserData(this);

身体2：

    BodyDef def = new BodyDef();
    FixtureDef fixtureDef = new FixtureDef();

    def.type = BodyDef.BodyType.DynamicBody;
    def.position.set(getX() - (getWidth()* getScaleX()) , getY() - (getHeight() * getScaleY()));

    CircleShape circleShape = new CircleShape();
    circleShape.setRadius(box2dWidth/2);

    fixtureDef.shape = circleShape;
    fixtureDef.density = 1f;
    fixtureDef.friction=0.5f;
    fixtureDef.filter.categoryBits = GC.CATEGORY_MONSTER;
    fixtureDef.filter.maskBits = GC.MASK_MONSTER;
    Body box = world.createBody(def);
    box.createFixture(fixtureDef);
    polygonShape.dispose();

    body = box;
    body.setAwake(true);
    body.setUserData(this);
    body.setAngularDamping(4);
    body.setFixedRotation(true);

我的分类详情：

public static final short CATEGORY_ARROW = 0x0001; // 0000000000000001 in binary
public static final short CATEGORY_MONSTER = 0x0002; // 0000000000000010 in binary
public static final short CATEGORY_SCENERY = 0x0004; // 0000000000000100 in binary
public static final short CATEGORY_GRAVEYARD = 0x0008; // 0000000000000100 in binary
public static final short CATEGORY_PENGUIN = 0X0016;
public static final short CATEGORY_FISH = 0x0032;
public static final short CATEGORY_MONSTER_MOUTH = 0x0064;

public static final short MASK_ARROW = CATEGORY_MONSTER | CATEGORY_SCENERY; 
public static final short MASK_MONSTER = CATEGORY_ARROW | CATEGORY_SCENERY ; 
public static final short MASK_PENGUIN = CATEGORY_SCENERY | CATEGORY_MONSTER; 
public static final short MASK_FISH = CATEGORY_MONSTER_MOUTH| CATEGORY_SCENERY; 
public static final short MASK_GRAVEYARD = CATEGORY_SCENERY;
public static final short MASK_MONSTER_MOUTH = CATEGORY_FISH | CATEGORY_SCENERY;

Body1和body2不会相互冲突，但我无法通过设置掩码位和类别位来实现它。有人请帮忙。

Answer 1

十六进制中的CATEGORY值是错误的。目前，您的CATEGORY的值为：

public static final short CATEGORY_ARROW = 0x0001; // 1 in binary
public static final short CATEGORY_MONSTER = 0x0002; // 10 in binary
public static final short CATEGORY_SCENERY = 0x0004; // 100 in binary
public static final short CATEGORY_GRAVEYARD = 0x0008; // 1000 in binary
public static final short CATEGORY_PENGUIN = 0X0016; // 10110 in binary
public static final short CATEGORY_FISH = 0x0032; // 110010 in binary
public static final short CATEGORY_MONSTER_MOUTH = 0x0064; // 1100100 in binary

所以MASK_MONSTER = CATEGORY_MONSTER | CATEGORY_SCENERY =二进制110 并且CATEGORY_MONSTER_MOUTH = 1100100二进制

最后，MASK_MONSTER | CATEGORY_MONSTER_MOUTH将匹配，因为它导致100

---

你的问题是，你的Hex计数是错的，你必须写：

public static final short CATEGORY_ARROW = 0x0001; // 1 in binary
public static final short CATEGORY_MONSTER = 0x0002; // 10 in binary
public static final short CATEGORY_SCENERY = 0x0004; // 100 in binary
public static final short CATEGORY_GRAVEYARD = 0x0008; // 1000 in binary
public static final short CATEGORY_PENGUIN = 0X0010; // 10000 in binary
public static final short CATEGORY_FISH = 0x0020; // 100000 in binary
public static final short CATEGORY_MONSTER_MOUTH = 0x0040; // 1000000 in binary

之后是0x80,0x100,0x200,0x400,0x800,0x1000等。