DrawLine doesn't work like in the textbook

Unity Engine
1

Hi guys, I’m trying to follow up on a C# Unity textbook I’m reading. It said that if I use this script on the main camera

using UnityEngine;
using System.Collections;
public class ReturnZombie : MonoBehaviour
{
    //Use this for initialization
    void Start ()
    {
    }
    //Update is called once per frame
    void Update ()
    {
        Debug.DrawLine(transform.position,
                       GetZombie().transform.position);
    }
    //returns a zombie
    Zombie GetZombie()
    {
        return (Zombie)GameObject.FindObjectOfType(typeof(Zombie));
    }
}

And created a gameobject with a zombie class attached to it, I’d see a line drawn between the object and the camera in scene view. Well, I don’t see it. :frowning:

This is the screenshot the textbook attached that I’m supposed to see:

What am I doing wrong?

2

I guess you actually see the line but only for one frame… check the docs. try to set the next two parameters as well…

3

What docs? What parameters?
It’s supposed to be in scene view, so not only for “one frame”. Look at the screenshot from the textbook.

4

Look here: Unity - Scripting API:
if you want the line to be permanent, use Gizmos.DrawLine() instead and call it in OnDrawGizmos() instead of Update().

Don’t forget to enable Gizmos in your game view.

5

Many thanks! :slight_smile:

6

Update is only called during game mode, if you are expecting to see it in scene view during EDIT MODE then you can use gizmos

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