Vector3.sqrMagnitude Manual     Reference     Scripting  
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Vector3.sqrMagnitude

var sqrMagnitude : float

Description

Returns the squared length of this vector (Read Only).

Calculating the squared magnitude instead of the magnitude is much faster. Often if you are comparing magnitudes of two vectors you can just compare their squared magnitudes.

// detects when the other transform is closer than closeDistance
// this is faster than using Vector3.magnitude
var other : Transform;
var closeDistance = 5.0;

function Update()
{
if (other) {
var sqrLen = (other.position - transform.position).sqrMagnitude;
// square the distance we compare with
if( sqrLen < closeDistance*closeDistance )
print ("The other transform is close to me!");
}
}

See Also: magnitude.