How to make a line render show a bounce?

Unity Engine
1

I have a ball that bounces around the screen off of a paddle. I need to make a guide line when it get close to the paddle showing what direction the ball would bounce off towards. I think the best way to do this is to do a shpere cast around the paddle and when the ball gets in range spawn a line render object as a child of the ball. and set the positions starting with the ball and ending with the paddle. But I don’t know how to get where the ball will hit or how to get where the ball will bounce. Anyone else have any experience with this?

2

Add component called TrailRenderer to the ball. It will create a line which then disappears over time. Its color, time etc can be tweaked in settings.

EDIT: You may make a function which returns the distance between the ball and the paddle, which then enables TrailRenderer.

Cheers :slight_smile:

3

With particles?

4

What I need is the opposite of trail renderer I need to show the player where the ball is going to hit the paddle and the path it will follow afterwards.

5

Sorry for my bad english, I also misunderstood your question.

Gets this code if you want for that.

using UnityEngine;
using System.Collections;

public class guideLine : MonoBehaviour {

    public GameObject prefab;
    public float length = 15f;
    public float step = 0.25f;
    public LayerMask layer;

    GameObject[] prefabs;
    Ray ray = new Ray();
    RaycastHit hit = new RaycastHit();

    // Use this for initialization
    void Start () {

        prefabs = new GameObject[Mathf.FloorToInt(length/step)];

        for(int i=0;i<prefabs.Length;i++) prefabs[i] = (GameObject)Instantiate(prefab);
   
    }
   
    // Update is called once per frame
    void Update () {

        transform.Rotate(0f,Input.GetAxis("Horizontal"),0f);
   
    }


    void FixedUpdate(){

        ray.origin = transform.position;
        ray.direction = transform.forward;

        int index = 0;
        float distance = 0f;

        while(index<prefabs.Length){


            if(Physics.Raycast(ray,out hit,step,layer)){

                distance += Vector3.Distance(ray.origin,hit.point);

                if(distance < step){

                    ray.origin = hit.point;
                    ray.direction = Vector3.Reflect(ray.direction,hit.normal);

                } else {

                    Physics.Raycast(ray,out hit,length,layer);
                    prefabs[index].transform.position = ray.origin = ray.origin + ray.direction * Mathf.Abs(step-distance);
                    if(hit.point == ray.origin) ray.direction = Vector3.Reflect(ray.direction,hit.normal);
                    index++;
                    distance = 0f;

                }

            } else {

                Physics.Raycast(ray,out hit,length,layer);
                prefabs[index].transform.position = ray.origin = ray.origin + ray.direction * Mathf.Abs(step-distance);
                if(hit.point == ray.origin) ray.direction = Vector3.Reflect(ray.direction,hit.normal);
                index++;
                distance = 0f;
   
            }

        }

    }

}

Length variable is path total length, and step is separation between path gameobjects.

Download proyect link.

1 Like
6

Amazing man I love you lol. Thanks a ton.