void convertFractionalCoordinates(int modelIndex, Point3f pt) {
		if (modelIndex < 0)
			modelIndex = 0;
		if (modelIndex >= cellInfos.length || cellInfos[modelIndex] == null)
			return;
		String str = "Frame convertFractional " + pt + "--->";
		cellInfos[modelIndex].toCartesian(pt);
		Logger.info(str + pt);
	}