Make camera rotate when it dollies in [visual aid included]

Camera & Cinematics Camera
1

I have a camera script that lets you control the camera and orbit it around a planet and dolly in, but I want the camera to rotate while it dollies. Thus, instead of simply seeing the planet’s surface closer, you would also see the horizon. For some reason I’m having a hard time putting into words what I want to happen so I made a picture:

Here’s my code:

var target : Transform;
var distanceMin = 2.0;
var distanceMax = 15.0;
var distanceInitial = 3.0;
var scrollSpeed = 1.0;

var xSpeed = 250.0;
var ySpeed = 120.0;

var yMinLimit = -20;
var yMaxLimit = 80;

private var x = 0.0;
private var y = 0.0;
private var distanceCurrent = distanceInitial;

@AddComponentMenu("Camera-Control/Mouse Orbit")
partial class MouseOrbit { }

function Start () {
    var angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;

	// Make the rigid body not change rotation
   	if (rigidbody)
		rigidbody.freezeRotation = true;
}

function LateUpdate () {
    if (target) {
        
        // Only rotate if right-click-dragging
        if (Input.GetMouseButton(1))
        {
            x += Input.GetAxis("Mouse X") * xSpeed * 0.02;
            y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02;
        }
        
 		distanceCurrent -= Input.GetAxis("Mouse ScrollWheel") * scrollSpeed;
	
		distanceCurrent = Mathf.Clamp(distanceCurrent, distanceMin, distanceMax);
 		y = ClampAngle(y, yMinLimit, yMaxLimit);
		       
        var rotation = Quaternion.Euler(y, x, 0);
        var position = rotation * Vector3(0.0, 0.0, -distanceCurrent) + target.position;
            
        transform.rotation = rotation;
        transform.position = position;
    }
}

static function ClampAngle (angle : float, min : float, max : float) {
	if (angle < -360)
		angle += 360;
	if (angle > 360)
		angle -= 360;
	return Mathf.Clamp (angle, min, max);
}

can haz help?

2

Bump #1!

3

Do you want the camera constantly looking at the horizon? And do you want the camera to dolly along the line of its direction or to rise and fall perpendicularly to the sphere?