If you are porting a left-handed modeling application where the z-axis points up, you must do a rotation on all the vertex data in addition to the previous steps.
如果你正在移植z轴指向上的左手系建模应用程序，你就必须将所有的顶点数据做上述的处理。
If you are porting a left-handed modeling application where the z-axis points up, you must do a rotation on all the vertex data in addition to the previous steps.
如果你正在移植z轴指向上的左手系建模应用程序，你就必须将所有的顶点数据做上述的处理。
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