AppExperiments

using UnityEngine;
using System.Collections;

/// <summary>
/// Rotates Forward basis vector towards target
/// with rotation limited to be around the right axis only.
/// </summary>
public class rightAxisLookAt : MonoBehaviour {
  public Transform Target;
  public float filterRate = 1f;
  public bool IsFilterOn = false;
  public float LookAtXOffset = -.1f;
  public bool IsLooking;


  void Start() {
    Vector3 LookAtOffsetPos = new Vector3(LookAtXOffset, Target.localPosition.y, Target.localPosition.z);
    Target.localPosition = LookAtOffsetPos;
  }

  // Update is called once per frame
  void Update() {
    if (Target == null || !IsLooking)
      return;

    Vector3 lookVector = Target.position - transform.position;
    float rightProject = Vector3.Dot(lookVector, transform.right);
    lookVector -= transform.right * rightProject;
    //				Debug.DrawRay (transform.position, lookVector, Color.red);
    //				Debug.DrawRay (transform.position + lookVector, lookAt.position - (transform.position + lookVector), Color.red);
    //				Debug.DrawRay (transform.position, transform.forward, Color.blue);
    Quaternion lookRotate = Quaternion.FromToRotation(transform.forward, lookVector);
    float lookAngle;
    Vector3 lookAxis;
    lookRotate.ToAngleAxis(out lookAngle, out lookAxis);
    if (IsFilterOn == true) {
      transform.Rotate(lookAxis, lookAngle * filterRate, Space.World);
    }
    else {
      transform.Rotate(lookAxis, lookAngle * 1.0f, Space.World);
    }
  }
}