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我现在想用Q3DBars或者Q3DScatter做一个数据的分布分析，需要从三个维度来处理，其中的ValueAxis不再显示类似QT例子中那样的从一个基准值显出的bar，而是一个范围，显示最低值和最高值范围的bar，貌似标准的Q3DBars或者Q3DScatter并不直接支持，是否需要重新继承Q3DBars或者Q3DScatter来完成这样的功能？如果需要继承的话，需要重载哪一个函数来绘制bar？
