public interface ICollidable
    {
        /// <summary>
        /// Test collision with another collidable
        /// </summary>
        /// <param name="tThis"></param>
        /// <param name="other"></param>
        /// <param name="tOther"></param>
        /// <returns></returns>
        bool Collides( ICollidable other);

        /// <summary>
        /// Try to intersect a ray with the collidable and return
        /// the location of the intersections.
        /// </summary>
        /// <param name="tThis"></param>
        /// <param name="ray"></param>
        /// <returns></returns>
        IEnumerable<Vector3> IntersectRay( PointDirection3 ray);

        /// <summary>
        /// Transform the location/rotation of the collidable
        /// </summary>
        /// <param name=""></param>
        /// <param name="transform"></param>
        /// <returns></returns>
        ICollidable Transform(Matrix4x4 transform);
    }