Vector3f getSpinAxis(String axisID, int modelIndex) {
		Draw draw = (Draw) frame.shapes[JmolConstants.SHAPE_DRAW];
		if (draw == null)
			return null;
		int meshIndex = draw.getIndexFromName(axisID);
		if (meshIndex < 0) {
			return null;
		}
		return draw.getSpinAxis(meshIndex, modelIndex);
	}