Vector3 arrays in C#

Questions & Answers
1

Hi everyone, thanks for checking this out. I am totally mystified… trying to build an array which keeps the Vector3 position of a game object over time so it can be referenced when a triggering event occurs.

Here’s the relevant code:

using UnityEngine;
using System.Collections;

public class ThrowTrajectory : MonoBehaviour {

	public int arraySpaces = 20;

	public Transform rightHand;

	private Vector3[] rhPos;

	void Start () { //THIS WORKS PERFECTLY

		Vector3[] rhPos = new Vector3[arraySpaces];

		Vector3 v = new Vector3(0,0,0);

		//Fill the array with initial vectors
		for (int i = 0; i < arraySpaces; i++){

			rhPos *= v;*

_ Debug.Log ("rh " + i + " : " + rhPos*);*_

* }*
* }*

* void Update () {*

* Vector3 v = rightHand.position; //This works*
* Debug.Log (v); //This works*
* for (int i = 0; i < arraySpaces; i++){*
_ rhPos = v; //THIS DOESN’T WORK - null reference exception - WHY? It’s the identical syntax to the Start method???
Debug.Log ("rh " + i + " : " + rhPos*);*_

* } *
* }*
}
Any ideas??

2

Your problem is on line 15:

    Vector3[] rhPos = new Vector3[arraySpaces];

You are declaring a local variable with the same name ‘rhPos’ as the class instance variable. This variable hides the class variable. Change line 15 to:

     rhPos = new Vector3[arraySpaces];