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docs/api/math/vector3/projectonplane.md

@@ -0,0 +1,23 @@
+# Vector3::ProjectOnPlane
+
+```cpp
+static Vector3 ProjectOnPlane(const Vector3& vector, const Vector3& planeNormal)
+```
+
+将向量投影到平面上（减去沿平面法线的分量）。
+
+**参数：**
+- `vector` - 要投影的向量
+- `planeNormal` - 平面法线
+
+**返回：** `Vector3` - 平面上的投影向量
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Vector3 v(1.0f, 1.0f, 1.0f);
+Vector3 normal(0.0f, 1.0f, 0.0f);  // XZ 平面
+Vector3 projected = Vector3::ProjectOnPlane(v, normal);  // (1, 0, 1)
+```