原地址：http://game.ceeger.com/Manual/HOWTO-FixZAxisIsUp.html

Some 3D art packages export their models so that the z-axis faces upward. Most of the standard scripts in Unity assume that the y-axis represents?up?in your 3D world. It is usually easier to fix the rotation in Unity than to modify the scripts to make things fit.

一些3D制作包導出的模型是Z軸向上的，在Unity中大多數標準腳本，假設Y軸在3D世界中表示向上的。在Unity中非常容易修正旋轉而不用修改腳本。

Your model with z-axis points upwards?你的模型是Z軸向上

If at all possible it is recommended that you fix the model in your 3D modelling application to have the y-axis face upwards before exporting.

如果有可能，建議你在導出前在3D建模軟件中修正模型以便使Y軸向上。

If this is not possible, you can fix it in Unity by adding an extra parent transform:

如果做不到這一點，你可以在Unity中添加額外的父變換來修正它。

Create an empty GameObject using the GameObject->Create Empty menu?
使用GameObject->Create Empty菜單創建一個空的GameObject(游戲物體)

Position the new GameObject so that it is at the center of your mesh or whichever point you want your object to rotate around.?
定位這個新的游戲對象，使他位于網格的中心或者想要物體圍繞旋轉的點上

Drag the mesh onto the empty GameObject?
拖拽網格到這個空的游戲對象上

You have now made your mesh a Child of an empty GameObject with the correct orientation. Whenever writing scripts that make use of the y-axis as up, attach them to the Parent empty GameObject.

現在你已經將網格作為一個具有正確方向的游戲對象的子物體了，寫腳本的時候使用Y軸向上，并將他們附加給這個空的父物體上。

The model with an extra empty transform?帶有一個額外空變換的模型

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