使此向量具有大小为 1。
归一化后，向量保持相同方向，但长度为 1.0。
请注意，此函数将更改当前向量。如果您希望保持当前向量不变，请使用normalized变量。
如果此向量太小而无法归一化，它将被设置为零。
其他资源：normalized属性。
| a | 要归一化的向量。 |
Vector4 一个新的向量，与原始向量具有相同的方向，但大小为 1.0。
返回基于给定向量的归一化向量。归一化向量具有大小为 1，并且与给定向量方向相同。如果给定向量太小而无法归一化，则返回零向量。
请注意，这不会修改给定的向量。要修改并归一化当前向量，请使用Normalize函数，但不带参数。
其他资源：normalized函数。
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