2D raycasting mouse to select items

I am having trouble implementing a raycast into some code i've already had that works.

What i'm trying to do is use a raycast from a mouse to select one of 2 dogs on the screen and when selected the camera will zoom into the dog.

before implementing the raycast i would just have it be a button press and the camera would zoom into the dog with little to no problems. now the console is saying there's no instance of an object when i also see that the objects are selected with the raycast.

here is the code below: please if anyone can help with figuring out why the console is saying theres no reference i would appreciate any help!

Thank you,

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Camera_move : MonoBehaviour
{
public float cameraChangeSpeed = 2;
private Transform custompos;

Vector3 maincamerapos, transitionCamera;
Transform tr;
bool maincampos;

public float smooth = 4;
public float min = 2;
public float max = 15;
public float targetO;

void Start()
{
tr = transform;
maincamerapos = tr.position;
}



void Update()
{
if (Input.GetMouseButtonDown(0))
{
//Converting Mouse Pos to 2D (vector2) World Pos
Vector2 rayPos = new Vector2(Camera.main.ScreenToWorldPoint(Input.mousePosition).x, Camera.main.ScreenToWorldPoint(Input.mousePosition).y);
RaycastHit2D hit = Physics2D.Raycast(rayPos, Vector2.zero, 0f);

if (hit)
{
custompos = hit.transform;
Debug.Log(hit.transform.name);

Debug.Log(custompos);
}

if (maincampos == false)
{
maincampos = true;
tr.parent = custompos;
}
else
{
maincampos = false;
tr.parent = null;
}
Debug.Log(tr.parent);
}

// transition to dog
if (maincampos == true)
{
//transitionCamera = custompos.position;
transitionCamera = new Vector3(custompos.position.x + 3, custompos.position.y, -10f);

targetO = Mathf.Clamp(targetO, min, max);
Camera.main.orthographicSize = Mathf.MoveTowards(Camera.main.orthographicSize, targetO, smooth * Time.deltaTime);
}

else transitionCamera = maincamerapos;

// transition to main camera position
if (tr.position != transitionCamera)
{
tr.position = Vector3.MoveTowards(tr.position, transitionCamera, Time.deltaTime * cameraChangeSpeed);

targetO = Mathf.Clamp(targetO, min, max);
Camera.main.orthographicSize = Mathf.MoveTowards(Camera.main.orthographicSize, 5, smooth * Time.deltaTime);
}
}
}

 

Here you create a raycast with no direction (Vector3.zero), so even if you have your mouse on an object, the ray will not "intersect" with the collider. I recommend using a Physics2D.OverlapPoint() to get an array of colliders under your mouse instead. You can replace the code above with something like this:

Code (CSharp):

1. Vector2 mousePos = new Vector2(Camera.main.ScreenToWorldPoint(Input.mousePosition).x, Camera.main.ScreenToWorldPoint(Input.mousePosition).y);
2.  
3. Collider2D[] collidersUnderMouse = new Collider2D[4];
4. int numCollidersUnderMouse = Physics2D.OverlapPoint(mousePos, new ContactFilter2D(), collidersUnderMouse);
5.  
6. for (int i = 0; i < numCollidersUnderMouse; ++i)
7. {
8.     // Check if collidersUnderMouse[i] is the type of object you want using tags or GetComponent()
9.     // Then do what you want to it
10. }

Keep in mind if there are multiple colliders under your mouse, you will only detect a certain number of them up to the size of the Collider2D array (I put 4, you can put more if you think you need it).