Can't produce lines using Line Renderer.

Unity Engine
1

I’m currently working on a 2D bubble shooter like game. Where I want an aim line to help player aim. I’m using Line Renderer to do so. Following is the code I’m using to set positions:

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

public class testAimLine : MonoBehaviour
{
    public GameObject obj;
    LineRenderer lr;

    [SerializeField]
    public int numberOfReglections;

    Vector3[] pos = new Vector3[5];
    Vector3[] rot = new Vector3[5];

    private void Start()
    {
        lr = GetComponent<LineRenderer>();

        pos[0] = gameObject.transform.position;
        rot[0] = gameObject.transform.eulerAngles;

        lr.SetPosition(0, pos[0]);
    }
   
    private void Update()
    {
        for (int i = 1; i < numberOfReglections; i++)
        {
            RaycastHit2D ray = Physics2D.Raycast(pos[i - 1], rot[i - 1]);

            pos[i] = ray.point;
            rot[i] = Vector3.Reflect(pos[i], ray.normal);

            lr.SetPosition(i, pos[i]);
        }
    }
}

But due to some unknown reasons it is not working. I’m almost new to coding so be easy on me :wink:

2

if you start your index from 1, try yo change i <= numberOfReglections

When you use LineRenderer, if you want to display it on some canvas, change the “Render Mode” of the Canvas in “Screen Space - Camera”

Change this also in: pos = ray.point + Vector3.forward * 1;
[quote=“NidoAnxari, post:1, topic: 671794, username:NidoAnxari”]
lr.SetPosition(0, pos[0]);
*[/quote]
*
and this: lr.SetPosition(0, pos[0] + Vector3.forward * 1);
If this all dont work, assing a new material to the line renderer, and change the shader in Sprite/Default

3

Is there any special reason why you multiply a forward vector by one? Wouldn’t that result in the same thing?

4

This is the simplified prototype script.

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

public class testAimLine_1 : MonoBehaviour
{
    public GameObject testObj;

    private void Update()
    {
        RaycastHit2D hit0 = Physics2D.Raycast(transform.position, transform.up);
        Vector2 reflection = Vector2.Reflect(hit0.point, hit0.normal);

        RaycastHit2D hit1 = Physics2D.Raycast(hit0.point, reflection);

        testObj.transform.position = hit1.point;

        Debug.DrawLine(transform.position, hit0.point, Color.red);
        Debug.DrawLine(hit0.point, hit1.point, Color.blue);
    }
}

This is the screenshot:

1366×768 152 KB

Red is the first line but blue line that should be the reflected one is absent.

5

yes, if the line is generated without distance from the camera, maybe the line isn’t show for the clipping plane Near of the camera

6

here there is not any Line Renderer

7

Because line renderer is not causing problem. Problem is with Ray casting.

8

Maybe Hit1 is null beacause it dont hit anything

9

I also tried if statement but nothing happened.

10

But what do you want to do esactly?

11

I want to make an aim line like in puzzle bobble

12

Ahhhh, ok i understand the error: you display the blue line on the top of the red one, in reverse:

Change this with

RaycastHit2D hit1 = Physics2D.Raycast(hit0.point, reflection + Vector2.right * 90);
13

I will try it. Hope it works. :smiling_face:

14

Anyway thanks a lot.

15

let me know :smile:

16

Alas, it didn’t work.

17

I am thinking that my whole concept is wrong. But can’t find another solution.

18

Vector2 reflection = Vector2.Reflect(hit0.point, hit0.normal);

Try this:
Vector2 reflection = Vector2.Reflect(hit0.point, hit0.normal * 1000);

I don’t think this can be a problem, but maybe change something

19

I’ll try.

20

It didn’t work.