c++ - Box2D Contact Listener Collision 仅间歇性工作

Question

我有一个与动态物体碰撞的动态物体和一个简单的接触监听器类，如下所示:

void myContactListener::BeginContact(b2Contact* contact)
{
    void* bodyUserData = contact->GetFixtureA()->GetBody()->GetUserData();

    if (bodyUserData)
    {
        static_cast<EnemyEntity*>(bodyUserData)->startContact();
    }

    bodyUserData = contact->GetFixtureB()->GetBody()->GetUserData();

    if (bodyUserData)
    {
        static_cast<EnemyEntity*>(bodyUserData)->endContact();
    }
}

void myContactListener::EndContact(b2Contact* contact)
{
    void* bodyUserData = contact->GetFixtureA()->GetBody()->GetUserData();

    if (bodyUserData)
        static_cast<EnemyEntity*>(bodyUserData)->endContact();

    bodyUserData = contact->GetFixtureB()->GetBody()->GetUserData();

    if (bodyUserData)
        static_cast<EnemyEntity*>(bodyUserData)->endContact();
}

每当我将其中一个动态物体移动到彼此时，总是会在第一时间检测到碰撞并停止碰撞。但是，如果我尝试再次碰撞它们，第一次后通常不会检测到任何碰撞。有时确实如此。我该怎么做才能解决这个问题？我的代码中没有其他内容涉及任何 Box2D 代码。

这是我的联系监听器头文件:

class myContactListener : public b2ContactListener
{
private:
public:
    // Contact listener methods
    void BeginContact(b2Contact* contact);
    void EndContact(b2Contact* contact);
};

以及 EnemyEntity Box2D 方法:

void EnemyEntity::createStarBox2DCollision(b2World *world)
{
    enemyType = EnemyType::Star;

    def.type = b2_dynamicBody;
    def.position.Set(1000, 1000);
    body = world->CreateBody(&def);
    box.SetAsBox(rectShapeSize.x / 2, rectShapeSize.y / 2);

    fixtureDef.shape = &box;
    fixtureDef.density = 1.0;
    fixtureDef.friction = 0.3;

    body->CreateFixture(&fixtureDef);
    body->SetUserData(this);
}

Answer 1

看起来你应该有

void myContactListener::BeginContact(b2Contact* contact)
{
    ...
        static_cast<EnemyEntity*>(bodyUserData)->startContact();
    }
}

而不是

void myContactListener::BeginContact(b2Contact* contact)
{
    ...
    static_cast<EnemyEntity*>(bodyUserData)->endContact();
    }
}

对于两个物体，而不是仅仅对于 A