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docs/api/math/matrix4/multiplyvector.md

@@ -0,0 +1,21 @@
+# Matrix4::MultiplyVector
+
+```cpp
+Vector3 MultiplyVector(const Vector3& v) const
+```
+
+使用矩阵变换方向向量（不包含平移）。
+
+**参数：**
+- `v` - 要变换的方向向量
+
+**返回：** `Vector3` - 变换后的方向
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Matrix4 model = Matrix4::TRS(pos, rot, scale);
+Vector3 worldDir = model.MultiplyVector(localDir);
+```