Unknown Quality

var circ:b2CircleDef = new b2CircleDef();
circ.radius = 50 / m_physScale;
circ.density = 1;
circ.friction = 1;
var bd:b2BodyDef = new b2BodyDef();
bd.AddShape(circ);
 bd.position.Set(100 / m_physScale, 100 / m_physScale);
 var body:b2Body =  m_world.CreateBody(bd);

var jd:b2RevoluteJointDef = new b2RevoluteJointDef();

//もーたー
jd.enableMotor = true;
jd.motorSpeed = -4;
jd.motorTorque = 10000000;
            
jd.anchorPoint.Set(body.m_position.x , body.m_position.y );
jd.body1 = m_world.m_groundBody;
jd.body2 = body;
m_world.CreateJoint(jd);