c# - Is there a way to move object much faster on linerenderer line?

Question

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

public class MoveOnCurvedLine : MonoBehaviour
{
    public LineRenderer lineRenderer;
    public GameObject objectToMove;
    public float speed;
    public bool go = false;
    public bool moveToFirstPositionOnStart = false;

    private Vector3[] positions;
    private Vector3[] pos;
    private int index = 0;

    // Start is called before the first frame update
    void Start()
    {
        pos = GetLinePointsInWorldSpace();

        if (moveToFirstPositionOnStart == true)
        {
            objectToMove.transform.position = pos[index];
        }
    }

    Vector3[] GetLinePointsInWorldSpace()
    {
        positions = new Vector3[lineRenderer.positionCount];
        //Get the positions which are shown in the inspector 
        lineRenderer.GetPositions(positions);


        //the points returned are in world space
        return positions;
    }

    // Update is called once per frame
    void Update()
    {
        if (go == true)
        {
            Move();
        }
    }

    void Move()
    {
        objectToMove.transform.position = Vector3.MoveTowards(objectToMove.transform.position,
                                                pos[index],
                                                speed * Time.deltaTime);

        if (objectToMove.transform.position == pos[index])
        {
            index += 1;
        }

        if (index == pos.Length)
            index = 0;
    }
}

Even if I'm setting the speed value to 1000 or even to 10000 the speed is faster but not so fast or not very fast.

There are 1157 position in the variable array positions. So it's a bit a problem to move fast no so many positions and in other cases there might be 5000 positions or more depending on the linerenderer line length.

but I saw in some youtube demos cars and objects moving fast very fast on curved lines or very long length lines.

Answer 1

Figure out how much distance to move in the current frame, then loop through points until you've traveled that distance:

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

public class MoveOnCurvedLine : MonoBehaviour
{
    public LineRenderer lineRenderer;
    public GameObject objectToMove;
    public float speed;
    public bool go = false;
    public bool moveToFirstPositionOnStart = false;

    private Vector3[] positions;
    private Vector3[] pos;
    private int index = 0;

    // Start is called before the first frame update
    void Start()
    {
        pos = GetLinePointsInWorldSpace();

        if (moveToFirstPositionOnStart == true)
        {
            objectToMove.transform.position = pos[index];
        }
    }

    Vector3[] GetLinePointsInWorldSpace()
    {
        positions = new Vector3[lineRenderer.positionCount];
        //Get the positions which are shown in the inspector 
        lineRenderer.GetPositions(positions);


        //the points returned are in world space
        return positions;
    }

    // Update is called once per frame
    void Update()
    {
        if (go == true)
        {
            Move();
        }
    }

    void Move()
    {
        Vector3 newPos = objectToMove.transform.position;
        float distanceToTravel = speed * Time.deltaTime; 

        bool stillTraveling = true;
        while (stillTraveling)
        {
            Vector3 oldPos = newPos;
            newPos = Vector3.MoveTowards(oldPos, pos[index], distanceToTravel);
            distanceToTravel -= Vector3.Distance(newPos, oldPos);

            if (newPos == pos[index]) // Vector3 comparison is approximate so this is ok
            {
                index = (index + 1) % pos.Length;
            }
            else 
            {
                stillTraveling = false;
            }
        }

        objectToMove.transform.position = newPos;
    }
}