Join box2d B2旋转点未断开

我想不出怎样才能使接头断裂。基本上，使用b2PolygonShape将旋转关节添加到两个b2Body上。但当汽车在上面行驶时，接头不会断裂。相反，汽车通过多边形形状

到目前为止，我一直在尝试下面的方法

            b2BodyDef bodyDef;
    bodyDef.position.Set(xPos/PTM_RATIO, yPos/PTM_RATIO);
    bodyDef.angle = atan(dy/dx);

    bodyDef.userData = sp;
    bodyDef.type = b2_dynamicBody;

    b2Body* body = world->CreateBody(&bodyDef);

    b2PolygonShape shape;
    b2Vec2 rectangle1_vertices[4];
    rectangle1_vertices[0].Set(-len/2, -width/2);
    rectangle1_vertices[1].Set(len/2, -width/2);
    rectangle1_vertices[2].Set(len/2, width/2);
    rectangle1_vertices[3].Set(-len/2, width/2);
    shape.Set(rectangle1_vertices, 4);

    b2FixtureDef fd;
    fd.shape = &shape;
    fd.density = 10.0f;
    body->CreateFixture(&fd);

    edge.body = body;

// The code below is not breaking the joint even though enableLimit = true. 
                b2RevoluteJointDef jointDef;
            b2Vec2 anchor = vertex.body->GetPosition();
            jointDef.lowerAngle = -10.0 * b2_pi / 180.0f;
            jointDef.upperAngle = 10.0 * b2_pi / 180.0f;
            jointDef.enableLimit = true;
            jointDef.maxMotorTorque = 1000.0f;
            jointDef.enableMotor = true;

            //prevEdge and edge are b2Body with b2PolygonShape.
            jointDef.Initialize(prevEdge.body, edge.body, anchor);
            world->CreateJoint(&jointDef);

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感谢您的帮助

box2d中的接头不会断裂。如果您正在设置

enableLimit=true

则表示box2D将使用您的

lowerAngle

和

apperAngle

限制。box2d试验台中有一个易碎的示例。看一看。

如果对关节施加的力过大，导致关节锚定位置分开，则可以检测它们何时移动过远，然后删除关节