归一化三维笛卡尔坐标系下的向量 d，将 d 修改为指向相同方向的单位向量。
This function normalizes a 3D Cartesian vector d in-place, modifying d to represent a unit vector pointing in the same direction. (Note: This function is incomplete and requires implementing square root calculation)
归一化三维笛卡尔坐标系下的向量 d，将 d 修改为指向相同方向的单位向量。 This function normalizes a 3D Cartesian vector d in-place, modifying d to represent a unit vector pointing in the same direction. (Note: This function is incomplete and requires implementing square root calculation)