NoClipMouseLook

NoClipMouseLook.cs

using UnityEngine;
using System.Collections;

public class NoClipMouseLook : MonoBehaviour {

 public float sensitivityX = 8F;
 public float sensitivityY = 8F;

 float mHdg = 0F;
 float mPitch = 0F;

 void Start()
 {
     // owt?
 }

 void Update()
 {
     if (!(Input.GetMouseButton(0) || Input.GetMouseButton(1)))
         return;

     float deltaX = Input.GetAxis("Mouse X") * sensitivityX;
     float deltaY = Input.GetAxis("Mouse Y") * sensitivityY;

     if (Input.GetMouseButton(0) && Input.GetMouseButton(1))
     {
         Strafe(deltaX);
         ChangeHeight(deltaY);
     }
     else
     {
         if (Input.GetMouseButton(0))
         {
             MoveForwards(deltaY);
             ChangeHeading(deltaX);
         }
         else if (Input.GetMouseButton(1))
         {
             ChangeHeading(deltaX);
             ChangePitch(-deltaY);
         }
     }
 }

 void MoveForwards(float aVal)
 {
     Vector3 fwd = transform.forward;
     fwd.y = 0;
     fwd.Normalize();
     transform.position += aVal * fwd;
 }

 void Strafe(float aVal)
 {
     transform.position += aVal * transform.right;
 }

 void ChangeHeight(float aVal)
 {
     transform.position += aVal * Vector3.up;
 }

 void ChangeHeading(float aVal)
 {
     mHdg += aVal;
     WrapAngle(ref mHdg);
     transform.localEulerAngles = new Vector3(mPitch, mHdg, 0);
 }

 void ChangePitch(float aVal)
 {
     mPitch += aVal;
     WrapAngle(ref mPitch);
     transform.localEulerAngles = new Vector3(mPitch, mHdg, 0);
 }

 public static void WrapAngle(ref float angle)
 {
     if (angle < -360F)
         angle += 360F;
     if (angle > 360F)
         angle -= 360F;
 }
}