iphone - BOX2D静摩擦

我正在创建这样的地面物体：

    // Define the ground body.
    b2BodyDef groundBodyDef;
    groundBodyDef.position.Set(0, 0); // bottom-left corner

    // Call the body factory which allocates memory for the ground body
    // from a pool and creates the ground box shape (also from a pool).
    // The body is also added to the world.
    b2Body* groundBody = world->CreateBody(&groundBodyDef);

    // Define the ground box shape.
    b2PolygonShape groundBox;

    // bottom
    groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(screenSize.width/PTM_RATIO,0));
    groundBody->CreateFixture(&groundBox,0);

    // top
    groundBox.SetAsEdge(b2Vec2(0,screenSize.height/PTM_RATIO), b2Vec2(screenSize.width/PTM_RATIO,screenSize.height/PTM_RATIO));
    groundBody->CreateFixture(&groundBox,0);

    // left
    groundBox.SetAsEdge(b2Vec2(0,screenSize.height/PTM_RATIO), b2Vec2(0,0));
    groundBody->CreateFixture(&groundBox,0);

    // right
    groundBox.SetAsEdge(b2Vec2(screenSize.width/PTM_RATIO,screenSize.height/PTM_RATIO), b2Vec2(screenSize.width/PTM_RATIO,0));
    groundBody->CreateFixture(&groundBox,0);

如何设置摩擦力？
谢谢。

最佳答案

您需要从夹具定义（b2FixtureDef）创建夹具，在其中可以设置特定的摩擦力。像这样：

b2FixtureDef fixtureDef;

fixtureDef.shape = &groundBox;
fixtureDef.density = 0.0f;
fixtureDef.friction = YOUR_FRICTION_VALUE;

groundBody->CreateFixture(&fixtureDef);

关于iphone - BOX2D静摩擦，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6695228/