unity Vector3 平方

unity Vector api

Vector3.magnitude 和  Vector3.sqrMagnitude用法

Vector3.magnitude -->  把vertor數字平方相加在開根號

Vector3.sqrMagnitude-->把vertor數字平方

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假設 Vector3(2,3,4)-->>Vector3.magnitude =sqrt(x^x+y^y+z^z)

=sqrt(2*2+3*3+4*4)=sqrt(29)=5.385165

用來計算距離很好用  

Vector3.sqrMagnitude=( x^x+y^y+z^z)=(29)

sqrMagnitude不開根號,速度上sqrMagnitude更快效能好

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Vector3.forward  =>Vector3(0, 0, 1).

Vector3.back    =>Vector3(0, 0, -1).

Vector3.down    =>Vector3(0, -1, 0).

Vector3.left  =>Vector3(-1, 0, 0).

Vector3.normalized=>Vector3(1, 1, 1).