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Vector3.Dot

static function Dot (lhs : Vector3, rhs : Vector3) : float

Description

Dot Product of two vectors.

Returns lhs . rhs.

For normalized vectors Dot returns 1 if they point in exactly the same direction; -1 if they point in completely opposite directions; and a number in between for other cases (e.g. Dot returns zero if vectors are perpendicular).

For vectors of arbitrary length the Dot return values are similar: they get larger when the angle between vectors decreases.

// detects if other transform is behind this object
var other : Transform;
function Update()
{
if (other) {
var forward = transform.TransformDirection(Vector3.forward);
var toOther = other.position - transform.position;
if (Vector3.Dot(forward,toOther) < 0)
print ("The other transform is behind me!");
}
}