diff --git a/03-UnrealEngine/Math/四元数学习笔记.md b/03-UnrealEngine/Math/四元数学习笔记.md
index f4e40d8..443c8b7 100644
--- a/03-UnrealEngine/Math/四元数学习笔记.md
+++ b/03-UnrealEngine/Math/四元数学习笔记.md
@@ -59,4 +59,19 @@ $$p \rightarrow q\cdot p \cdot q^-1$$
 ![image.png](https://cdn.jsdelivr.net/gh/blueroseslol/ImageBag@latest/ImageBag/Images/20231025144447.png)
 
 ## 四元数规范化
-$$x^2 + y^2 + z^2 =1$$
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+$$x^2 + y^2 + z^2 =1$$
+# FBX
+四元数旋转顺序 xyz
+旋转xyz分别为
+
+可以使用
+`FbxNode::RotationOrder`
+了解其顺序。
+
+the "roll" about the x-axis along the plane,  
+the "pitch" about the y-axis which extends along the wings of the plane,  
+and the "yaw" or "heading" about the z-axis
+
+# Qt
+四元数旋转顺序zyx 或 yxz
+旋转xyz分别为pitch yaw roll
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