getModelPosition(lnglat, altitude) {
        const me = this,
            coord = MercatorCoordinate.fromLngLat(lnglat, altitude);

        return {
            x: coord.x - me.modelOrigin.x,
            y: -(coord.y - me.modelOrigin.y),
            z: coord.z - me.modelOrigin.z
        };
    }
Projects a LngLat to a MercatorCoordinate, and returns the translated
mercator coordinates with the initial centerpoint of the map as the origin.
@param {LngLatLike} lnglat - The location to project
@param {number} altitude - The altitude in meters of the position
@returns {Object} The translated mercator coordinates with the initial
    centerpoint of the map as the origin