Rotate on Z-axis to face mouse pointer on Y-axis, rotation over time

Questions & Answers
1

I’m trying to make a turret that only rotates on the Z-axis, and faces the target object(in this case the mouse pointer) with the Y-axis. Anyone able to help me?

This is what I have so far, I modified the script from a youtube tutorial called “Top-down shooter”, which originally rotating at the Y-Axis to face with the Z-Axis.

using UnityEngine;
using System.Collections;

public class PlayerTurret : MonoBehaviour {

	public Weapon onTurret;
	public Camera cam;
	public Quaternion targetRotation;
	public float rotationSpeed;
	public float maxOffSet;
	public float minOffSet;

	// Use this for initialization
	void Start () {
	}
	
	// Update is called once per frame
	void Update () {
		cam = Camera.main;
		MouseControl ();
		if(transform.rotation.z > maxOffSet){
			transform.rotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y, maxOffSet);
		}
		if(transform.rotation.z < minOffSet){
			transform.rotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y, minOffSet);
		}
	}

	void MouseControl(){
		Vector3 mousePos = Input.mousePosition;
		mousePos = cam.ScreenToWorldPoint(new Vector3(mousePos.x,mousePos.y,cam.transform.position.y - transform.position.y));
		targetRotation = Quaternion.LookRotation(mousePos - new Vector3(transform.position.x,transform.position.y, 0));
		transform.eulerAngles = Vector3.up * Mathf.MoveTowardsAngle (transform.eulerAngles.z, targetRotation.eulerAngles.z, rotationSpeed * Time.deltaTime);
	}

}

Apperently this addaptation is not working correctly, if I rotate the object holding this Turret the turret will keep it’s local rotation and not the parent’s rotation. Anyone able to provide a solution?

2

To get the rotation around the Z axis to face a point in the XY plane (like the mouse pointer.

Vector3 toMouseVector = mousePos - transform.position;
float zRotation = Mathf.Atan2( toMouseVector.y, toMouseVector.x )*Mathf.Rad2Deg;

However, if I remember correctly, this makes the X axis point at the mouse… and you want to make the Y axis point at the mouse.

so you should instead do

 float zRotation = (Mathf.Atan2( toMouseVector.y, toMouseVector.x )*Mathf.Rad2Deg) - 90.0f;