Quaternion.LookRotation

static function LookRotation (forward : Vector3, upwards : Vector3 = Vector3.up) : Quaternion

Description

Creates a rotation with the specified forward and upwards directions.

If used to orient a Transform, the Z axis will be aligned with forward and the Y axis with upwards. Logs an error if the forward direction is zero.

JavaScript
    // Most of the time you can use:
// transform.LookAt instead
var target : Transform;
function Update () {
var relativePos = target.position - transform.position;
var rotation = Quaternion.LookRotation(relativePos);
transform.rotation = rotation;
}