Collision2D Calculations

Unity Engine
1

Hi!
I’ve got a little problem with Calculating a Collisions.I want my Game to calculate the difference in positions betwen Player and Every GameObjects with NPCEssentialsScript.The Player is for each A and D key moving 6.4 in the X axis and 10 for each W and S Key in Y axis.

public class PlayerEssentials : MonoBehaviour {
        private bool collW;
    private bool collS;
    private bool collA;
    private bool collD;
      //  ...
       void OnCollisionEnter2D(Collision2D coll)
            if(transform.position.y - NPCEssentials.tr.position.y == -10 && transform.position.x == NPCEssentials.tr.position.x) //W
            {
                print ("W");
                collW = true;
            }
            else if(transform.position.y - NPCEssentials.tr.position.y == 10 && transform.position.x == NPCEssentials.tr.position.x)//S
            {
                print ("S");
                collS = true;
            }
            else if(transform.position.x - NPCEssentials.tr.position.x == 6.4 && transform.position.y == NPCEssentials.tr.position.y)//A
            {
                print ("A");
                collA = true;
            }
            else if(transform.position.x - NPCEssentials.tr.position.x == -6.4 && transform.position.y == NPCEssentials.tr.position.y)//D
            {
                print ("D");
                collD = true;
            }
        }
    }
    void OnCollisionExit2D()
    {
        collW = false;
        collS = false;
        collA = false;
        collD = false;
    }
}

and the NPCEssentials.tr = transform(of the NPC).
When I’m running my game I’m getting NullReferenceException for each If in the code, but everyting is declared.

2

you’re not declaring the link of NPCEssentials anywhere in the above code. Something like:

public NPCEssentials _npce
_npce = this.GetComponent<NPCEssentials>();

_npce.tr.position.y etc etc
3

Nothing has changed.
I want to set in that if that the every GameObject with NPCEssentials script will Collide with my Player.
I really don’t know what the Console wants to tell me because everything is initialized.
I’ve dragged the Player in the Unity to the Player property in the inspector.

4

I’ve modified a part of my Script
Here it is:

if(coll.gameObject.tag == "NPC" || coll.gameObject.tag == "Object")
        {
            GameObject _NPC = coll.gameObject;
      
          
            if(Player.position.y - _NPC.transform.position.y == -10 && Player.position.x == _NPC.transform.position.x) //W
            {
                print ("W");
                collW = true;
            }
            else if(Player.position.y - _NPC.transform.position.y == 10 && Player.position.x == _NPC.transform.position.x)//S
            {
                print ("S");
                collS = true;
            }
            else if(Player.position.x - _NPC.transform.position.x == 6.4 && Player.position.y == _NPC.transform.position.y)//A
            {
                print ("A");
                collA = true;
            }
            else if(Player.position.x - _NPC.transform.position.x == -6.4 && Player.position.y == _NPC.transform.position.y)//D
            {
                print ("D");
                collD = true;
            }
        }

But when I’m tryin to make a collision,I can’t see my Custom Console Messages inside of the IF’s.
What am I doing wrong ?

I was also tryin to replase in the IF’s “_NPC” to “coll” but still nothing happens.
Everything is good :frowning: .