Box2DX.Collision.Shape.ComputeMass C# (CSharp) Method

        public abstract void ComputeMass(out MassData massData, float density);

        // We need separation create/destroy functions from the constructor/destructor because
        // the destructor cannot access the allocator or broad-phase (no destructor arguments allowed by C++).
        public void Create(BroadPhase broadPhase, Body body, Transform xf, FixtureDef def)
        {
            UserData = def.UserData;
            Friction = def.Friction;
            Restitution = def.Restitution;

            Body = body;
            _next = null;

            Filter = def.Filter;

            IsSensor = def.IsSensor;

            Shape = def.Shape.Clone();

            Shape.ComputeMass(out _massData, def.Density);

            // Create proxy in the broad-phase.
            Shape.ComputeAABB(out Aabb, ref xf);

            ProxyId = broadPhase.CreateProxy(Aabb, this);
        }