How i can rotate an object in one axis?

Questions & Answers
1

Hey guys.

I don t get to rotate an object about a single axis, so this points to another object.
I have a 2D application with an arrow in the middle of the screen and a ball up in the left side, i want the arrow to follow the ball as it continues moving. The ball moves in X and Y and the arrow should rotate only in Z. Anyone knows how to fix that?

thanks and sorry for my bad english!!

2

is this helpful?
put this script to arrow

using UnityEngine;
using System.Collections;
 
public class Arrow : MonoBehaviour {
 
    public Transform ball;//set from inspector
    public float speed = 3f;
 
 
    void Update(){
 
       //rotate to look at the ball
       transform.LookAt(ball.position);
       //Maybe you dont need this
       transform.Rotate(new Vector3(0,-90,0),Space.Self);//correcting the original rotation
 
 
       //move towards the ball
       if (Vector3.Distance(transform.position,ball.position)>0.1f){//move if distance from ball is greater than 0.1f
         transform.Translate(new Vector3(speed* Time.deltaTime,0,0) );
       }
 
    }
 
}