camera controller (unity3d) (mimics unity editor camera editing at runtime)

CameraMouseController

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class CameraMouseController : MonoBehaviour {

    public float translationSensitivity = 2;
    public float zoomSensitiviy = 10;

    public float rotationSensitiviry = 2;

    public string mouseHorizontalAxisName = "Mouse X";
    public string mouseVerticalAxisName = "Mouse Y";
    public string scrollAxisName = "Mouse ScrollWheel";

    Camera _camera;

    void Awake(){
        _camera = GetComponent<Camera>();
    }
	
	void Update () {
        //  translation
        float translateX = 0;
        float translateY = 0;

        if (Input.GetMouseButton(2)) {
            translateY = Input.GetAxis(mouseVerticalAxisName) * translationSensitivity;
            translateX = Input.GetAxis(mouseHorizontalAxisName) * translationSensitivity;
        }


        float zoom = Input.GetAxis(scrollAxisName) * zoomSensitiviy;

        transform.Translate(-translateX, -translateY, zoom);

        // rotation

        float rotationX = 0;
        float rotationY = 0;

        if (Input.GetMouseButton(1)) {
            rotationX = Input.GetAxis(mouseVerticalAxisName) * rotationSensitiviry;
            rotationY = Input.GetAxis(mouseHorizontalAxisName) * rotationSensitiviry;
        }

        transform.Rotate(0, rotationY, 0, Space.World);
        transform.Rotate(-rotationX, 0, 0 );

        // Focus
        if (Input.GetKeyDown(KeyCode.F)) {
            Vector3 mp = Input.mousePosition;
            Ray ray = _camera.ScreenPointToRay(mp);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit, Mathf.Infinity)) {
                FocusCameraOnGameObject(Camera.main, hit.transform.gameObject);
            }
        }
	}

    // http://answers.unity3d.com/questions/13267/how-can-i-mimic-the-frame-selected-f-camera-move-z.html
    Bounds CalculateBounds(GameObject go) {
        Bounds b = new Bounds(go.transform.position, Vector3.zero);
        Object[] rList = go.GetComponentsInChildren(typeof(Renderer));
        foreach (Renderer r in rList) {
            b.Encapsulate(r.bounds);
        }
        return b;
    }

    void FocusCameraOnGameObject(Camera c, GameObject go) {
        Bounds b = CalculateBounds(go);
        Vector3 max = b.size;
        float radius = Mathf.Max(max.x, Mathf.Max(max.y, max.z));
        float dist = radius / (Mathf.Sin(c.fieldOfView * Mathf.Deg2Rad / 2f));
        c.transform.position = go.transform.position + transform.rotation * Vector3.forward * -dist;
    }
}