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我想检测身体之间的碰撞，一个身体有圆形，30+有凸体。也许问题是因为检测到圆和凸之间的碰撞？请帮忙，两天找不到答案...我有 3 个课程：Player、ConctactListener和level1（我在其中创建多边形）。

在Player我设置类型kGameObjectPlayer：

    - (id) init {
        if ((self = [super init])) {
            type = kGameObjectPlayer;
        }
        return self;
    }
-(void) createBox2dObject:(b2World*)world {


    b2BodyDef playerBodyDef;
    playerBodyDef.type = b2_dynamicBody;

    playerBodyDef.position.Set(self.position.x/PTM_RATIO, self.position.y/PTM_RATIO);
    playerBodyDef.userData = self;
    playerBodyDef.fixedRotation = true;

    body = world->CreateBody(&playerBodyDef);

    b2CircleShape circleShape;
    circleShape.m_radius = 0.7;
    b2FixtureDef fixtureDef;
    fixtureDef.shape = &circleShape;
    fixtureDef.density = 1.0f;
    fixtureDef.friction = 1.0f;
    fixtureDef.restitution =  0.0f;
    body->CreateFixture(&fixtureDef);
}

在ContactListener 中：

    void ContactListener::BeginContact(b2Contact *contact) {
    GameObject *o1 = (GameObject*)contact->GetFixtureA()->GetBody()->GetUserData();
    GameObject *o2 = (GameObject*)contact->GetFixtureB()->GetBody()->GetUserData();

    if (IS_PLATFORM(o1, o2) && IS_PLAYER(o1, o2)) {
        CCLOG(@"-----> Player made contact with platform!");
    }
}

void ContactListener::EndContact(b2Contact *contact) {
    GameObject *o1 = (GameObject*)contact->GetFixtureA()->GetBody()->GetUserData();
    GameObject *o2 = (GameObject*)contact->GetFixtureB()->GetBody()->GetUserData();

    if (IS_PLATFORM(o1, o2) && IS_PLAYER(o1, o2)) {
        CCLOG(@"-----> Player lost contact with platform!");
    }
}

在level1中，我创建了静态多边形，这些多边形应该是玩家应该接触的地面。

    - (void) drawStaticPolygons
    {
        GameObject *ground = [[GameObject alloc] init];
        [ground setType:kGameObjectGround];

        //1st polygon
        b2Vec2 vertices1[4];
        vertices1[0].Set(0, 1);
        vertices1[1].Set(0, 0);
        vertices1[2].Set(16, 0);
        vertices1[3].Set(16, 1);

        b2BodyDef myBodyDef1;
        myBodyDef1.type = b2_staticBody;
        myBodyDef1.userData = ground;

        b2PolygonShape polygonShape1;
        polygonShape1.Set(vertices1, 4); 

        b2FixtureDef myFixtureDef1;
        myFixtureDef1.shape = &polygonShape1; //change the shape of the fixture
        myBodyDef1.position.Set(0,0); 
        b2Body *staticBody1 = world->CreateBody(&myBodyDef1);
        staticBody1->CreateFixture(&myFixtureDef1); //add a fixture to the body

        //2nd polygon
        ....
        //n polygon
    }

问题是如何让 ContactListener 知道我的多边形是kGameObjectGround？

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1 回答 1

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我看到的问题是，因为我没有检查其他事情，所以多边形形状必须是逆时针方向，并且顶点看起来不像遵循该规则。以逆时针顺序制作顶点并且应该可以工作。

于 2014-03-31T02:52:21.583 回答