c# - 有没有办法在 linerenderer 线上更快地移动对象？

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;
    }
}

即使我将速度值设置为 1000 甚至 10000，速度也会更快但不是那么快或不是很快。

可变数组位置共有 1157 个位置。因此，在没有那么多位置的情况下快速移动有点问题，在其他情况下，可能有 5000 个或更多位置，具体取决于 linerenderer 线的长度。

但我在一些 youtube 演示中看到汽车和物体在曲线或很长的线上快速移动。

标签： c#unity3d

Answer 1

计算出在当前帧中要移动多少距离，然后循环遍历点，直到你走过那个距离：

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;
    }
}