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Question by MileSplit · Nov 17, 2013 at 10:37 PM · c#error4.3

Help with Unity's Parallax Scrolling Script Object reference not set to an instance of an object

Hello,

I was trying to use unity's new Parallax Scrolling Script that they use in their 2d example project, but i get this error

NullReferenceException: Object reference not set to an instance of an object BackgroundParallax.Awake () (at Assets/Tutorial/Scripts/BackgroundParallax.cs:18)

I use unityscript which may be why i cant solve this problem, could anyone help me out? Thanks

Here is the Parallax Scrolling Script made by unity

 using UnityEngine;
 using System.Collections;
 
 public class BackgroundParallax : MonoBehaviour
 {
     public Transform[] backgrounds;                // Array of all the backgrounds to be parallaxed.
     public float parallaxScale;                    // The proportion of the camera's movement to move the backgrounds by.
     public float parallaxReductionFactor;        // How much less each successive layer should parallax.
     public float smoothing;                        // How smooth the parallax effect should be.
 
     private Transform cam;                        // Shorter reference to the main camera's transform.
     private Vector3 previousCamPos;                // The postion of the camera in the previous frame.
 
 
     void Awake ()
     {
         // Setting up the reference shortcut.
         cam = Camera.main.transform;
     }
 
 
     void Start ()
     {
         // The 'previous frame' had the current frame's camera position.
         previousCamPos = cam.position;
     }
 
 
     void Update ()
     {
         // The parallax is the opposite of the camera movement since the previous frame multiplied by the scale.
         float parallax = (previousCamPos.x - cam.position.x) * parallaxScale;
 
         // For each successive background...
         for(int i = 0; i < backgrounds.Length; i++)
         {
             // ... set a target x position which is their current position plus the parallax multiplied by the reduction.
             float backgroundTargetPosX = backgrounds[i].position.x + parallax * (i * parallaxReductionFactor + 1);
 
             // Create a target position which is the background's current position but with it's target x position.
             Vector3 backgroundTargetPos = new Vector3(backgroundTargetPosX, backgrounds[i].position.y, backgrounds[i].position.z);
 
             // Lerp the background's position between itself and it's target position.
             backgrounds[i].position = Vector3.Lerp(backgrounds[i].position, backgroundTargetPos, smoothing * Time.deltaTime);
         }
 
         // Set the previousCamPos to the camera's position at the end of this frame.
         previousCamPos = cam.position;
     }
 }
 
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avatar image Mamul · Nov 18, 2013 at 11:24 AM 0
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$$anonymous$$ake it public Transform cam; and drag the camera into the script in the editor this should work fine

avatar image MileSplit · Nov 18, 2013 at 08:49 PM 0
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Thanks tbkn that was my mistake thanks! Could you convert your comment to an answer so i can accept it?

avatar image Tomer-Barkan · Nov 18, 2013 at 10:39 PM 0
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Done. Glad to help.

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Answer by Tomer-Barkan · Nov 18, 2013 at 07:55 AM

You must have a camera in your scene, tagged "MainCamera" to use Camera.main.

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