Forcing Camera to Rotate

Questions & Answers
1

How would i be able to make that when
renderer.isVisible my camera rotates to look at the
object and the more i look at the faster and stronger the
camera rotates?

2

You can use the angle between the forward of the camera and the direction of the object to modify the rotation speed.

#pragma strict

var target : GameObject;
var minSpeed = 3.0;  // Degrees per second;
var maxSpeed = 30.0; 

private var maxAngle : float;

function Start() {
	// Generates an approximation of the max angle since isVisible 
	//   will return true when the pivot is not visible.
	var ray = Camera.main.ViewportPointToRay(Vector2(-.1, -.1));  
	maxAngle = Vector3.Angle(Camera.main.transform.forward, ray.direction); 
}

function Update () {

	if (target.renderer.isVisible) {
	
		var toTarget = target.transform.position - transform.position;
		var q = Quaternion.LookRotation(toTarget);
		var angle = Vector3.Angle(Camera.main.transform.forward, toTarget);
		
		var factor = 1.0 - Mathf.Clamp01(angle/maxAngle);
		var speed = minSpeed + (maxSpeed - minSpeed) * factor;
		
		transform.rotation = Quaternion.RotateTowards(transform.rotation, q, speed * Time.deltaTime); 
	}
}