public void GetMousePosition(string newJson)
        {
            if (LOG_MESSAGES)
                Debug.Log($"RECEIVE: GetMousePosition {newJson}");
            MousePayload m = Utils.SafeFromJson<MousePayload>(newJson);

            Vector3 mousePosition = new Vector3(m.x, Screen.height - m.y, 0);
            Vector3 hitPoint;

            if (builderRaycast.RaycastToGround(mousePosition, out hitPoint))
            {
                if (LOG_MESSAGES)
                    Debug.Log($"SEND: ReportMousePosition {m.id} {hitPoint}");
                WebInterface.ReportMousePosition(hitPoint, m.id);
            }
        }