Why isn't the variable being assigned?

Questions & Answers
1

I’m using the unity debugger to find out why a variable isn’t being changed. What I found was very strange.
alt text

The yellow mark is where the code execution currently is. So the variable hold should be assigned. The position 8,2,2 in map indeed holds a character object according to the debugger. However, hold which is assigned to map[8,2,2] does not have a reference to a character object, instead it has one to a null obj.

So my question is, why isn’t the variable being assigned properly?

Edit:

alt text

alt text

You can see that there is an object at map[8,2,2] already. The problem is that hold isn’t being assigned to the value at 8,2,2. Instead it is being assigned to a different Entity, which holds a reference to a null object.

Edit #2 (added code for Entity class)

using UnityEngine;
using System.Collections;
using Newtonsoft.Json;

[JsonObject(MemberSerialization.OptIn)]
public class Entity : System.IEquatable<Entity>
{
	[JsonProperty]
	public int x;
	[JsonProperty]
	public int y;
	[JsonProperty]
	public int z;
	[JsonProperty]
	public states type;
	
	public GameObject obj;
	
	public Entity()
	{
		obj = null;
		this.type=states.empty;
	}
	
	public Entity(GameObject reference, states type)
	{
		obj = reference;
		x = (int) obj.transform.position.x;
		y = (int) obj.transform.position.y;
		z = (int) obj.transform.position.z;
		this.type = type;
	}
	
	public bool Equals(Entity other)
	{
		return this.x==other.x&&this.y==other.y
			&&this.z==other.z&&this.type==other.type;
	}
			
	public string getCoordinatesasString()
	{
		return x.ToString()+','+y.ToString()+','+z.ToString()+','+type.ToString();
	}	
		
	public Vector3 getCoordinates()
	{
		return new Vector3(x,y,z);
	}
	
	public void setData(int x, int y, int z, states type)
	{
		this.x=x;
		this.y=y;
		this.z=z;
		this.type=type;
	}
	
}
2

Edit:

Oh! I don’t know how I missed this earlier… You can’t cast a float to an int using (int)someFloat… it won’t work!

You can use Mathf.RoundToInt(someFloat) instead. Try it.

So change the assignment line to

Entity hold = map[Mathf.RoundToInt(position.x), Mathf.RoundToInt(position.y), Mathf.RoundToInt(position.z)];