Update API documentation and remove obsolete plan files
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# Vector3::SqrMagnitude
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```cpp
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float SqrMagnitude() const
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```
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计算向量长度的平方。用于在不计算平方根的情况下比较长度,性能更优。
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**返回:** `float` - 向量长度的平方
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**线程安全:** ✅
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**复杂度:** O(1)
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**示例:**
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```cpp
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Vector3 v(3.0f, 4.0f, 0.0f);
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float sqrMag = v.SqrMagnitude(); // 25.0f
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```
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## 相关文档
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- [Vector3 总览](vector3.md)
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- [`Magnitude`](magnitude-instance.md) - 向量长度
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- [`Normalized`](normalized.md) - 归一化副本
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- [`static SqrMagnitude`](sqrmagnitude.md) - 静态版本
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