Box2D.Collision.Shapes.CircleShape.ComputeMass C# (CSharp) 메소드

        public override void ComputeMass(MassData massData, float density)
        {
            massData.Mass = density * Settings.PI * Radius * Radius;
            massData.Center.Set(P);

            // inertia about the local origin
            massData.I = massData.Mass * (0.5f * Radius * Radius + Vec2.Dot(P, P));
        }