Allow NPC to Shoot Bullets Towards Player Position on a Top Down Game

Unity Engine
1

I have two scripts one called Bullet that is in charge of bullet movement. Right now the bullet has a rigidbody, but the bullets only move to the right. I need it to to be aimed at the player’s position.
Code so far for Bullet script:
bulletRigid.velocity = new Vector2(transform.position.x, transform.position.y);

The second script is called Attack and is in charge of Instantiating the bullets:

Vector3 position = new Vector3(farRangeNPC.transform.position.x, farRangeNPC.transform.position.y, farRangeNPC.transform.position.z);
var bullets = MonoBehaviour.Instantiate(prefab, position, Quaternion.identity);

Keep in mind this is a top down game so the bullets are not being aimed at just left and right.

2

Just have your Attack script set the bullet’s velocity towards the player when they’re instantiated. No need for a Bullet script.

1 Like
3

Why would you assign a position to a velocity? A position isn’t a direction & speed.

Also, you don’t need to break down a transform into X, Y & Z to assign it as you did for your “position” assignment. Just do “Vector3 position = farRangeNPC.transform.position”.

Given what I see above, I would highly suggest you follow some scripting or physics tutorials on Unity Learn.

1 Like
4

Also, please do NOT cross-post.

https://forum.unity.com/threads/start-a-new-conversation-allow-npc-to-shoot-bullets-towards-player.1236247/

5

The Attack script is not attached to any Game Object so I can’t manipulate the velocity even by acessing the Bullets script because the Attack Script does not inherit from Mono so I can’t use GetComponent from my understanding?
Although I have added this line on the Attack script and no errors have shown on the IDE.
var vel = bullets.GetComponent<Rigidbody2D>().velocity;

If something like this is okay then how would I set the velocity towards the player?
Thank you for replying.

6

Sorry, I am new to this forum and could not find it, so I thought it was deleted. I will try and figure out how to delete it now.

7

I can delete the other thread for you, np.

1 Like
8

Given two Vector2 bulletPos and playerPos representing the current bullet and player positions respectively and a float bulletSpeed representing the speed you want the bullet to move then do something along the lines of:

bullet.velocity = (playerPos - bulletPos).normalized * bulletSpeed;

Where “bullet” above is the Rigidbody2D component.

1 Like
9

You need a reference to the Player, which since it’s not attached to a MonoBehavior, you’re going to either want to store it in a variable when you construct the object (supposing there’s only 1 player), or pass it in the parameters of the method call.

10

Thank you for the clarification. So just to double check bullet for my version would be?
var vel = bullets.GetComponent<Rigidbody2D>().velocity;

11

What do you mean by construct the object?

12

If you are just starting, I would again suggest following some starter tutorials on Scripting and 2D Physics.

The forums are not a substitue for tutorials and guides.

13

Sorry I just needed help with this particular issue.

14

I understand but the problem is that even though I gave you the answer, you replied with a question that has nothing to do with what I said i.e.

The problem is not getting the answer, the problem is understanding the answer which is why I suggest Unity Learn.

1 Like
15

I need to learn more I guess.

16

This is a different user account. Is this the same as the OP?

17

That’s not me, if that is what you mean.

1 Like
18

Yes, it’s what I meant. :slight_smile: A strange reply from out of the darkness.