手指在屏幕上滑动快速形成墙体、栅栏等直线型建筑

以2D为例，三维的你自己改一下。把下面的脚本放在一个空物体上，然后把预制拖入进去，我的预制体碰撞器使用的是环形碰撞器CircleCollider2D。半径的25倍就是两个栅栏之间的距离。然后添加一个线性渲染组件模拟拖拽轨迹。

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

public class InitFence : MonoBehaviour {

    public GameObject _Box;
    public float _Dis;

    private LineRenderer _LineRenderer;
    private Vector3 _StartPos;
    private Vector3 _EndPos;
    private Vector3 _TempPos;
    private Vector3 m_v3;

    private int num = 0;

    private bool _PressDown = false;

    private void Start()
    {
        //获取生成物体之间的距离
        _Dis = _Box.GetComponent<CircleCollider2D>().radius * 2;
        _LineRenderer = GetComponent<LineRenderer>();
    }

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            //初始化线性渲染点
            _LineRenderer.positionCount = 2;
            _StartPos =  ScreentoWorldPos(Input.mousePosition);
            _PressDown = true;