在鼠标位置实例化对象 [英] Instantiate Object at mouse position

问题描述

我创建了一个脚本，该脚本应该根据鼠标位置实例化游戏对象，但是出了点问题.而且它仅在屏幕中间的一个位置被实例化.

I have created a script which was supposed to instantiate gameobject according to mouse position but something has went wrong. And it is only being instantiated at one position and in the middle of the screen.

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

public class LineInstantiater : MonoBehaviour {

    public GameObject lineprefab;
    private GameObject linehandler;
    private Vector3 mousepos;

    void Update(){
        if (Input.GetMouseButton (0)) {
            mousepos = Camera.main.ScreenToWorldPoint (Input.mousePosition);
            linehandler = Instantiate (lineprefab,Camera.main.ScreenToWorldPoint(Input.mousePosition),Quaternion.identity) as GameObject ;
            linehandler.transform.position = mousepos;
        }
    }

}

请告诉我我的脚本出了什么问题.

Please tell me what is wrong with my script.

推荐答案

问题是Input.mousePosition没有z轴，因为鼠标坐标只有x和y轴. z轴就是0，因此当使用Camera.main.ScreenToWorldPoint时返回错误的位置.

The problem is that Input.mousePosition does not have z-axis because there is only x and y axis for mouse coordinate. The z axis is simply 0 therefore returning wrong position when Camera.main.ScreenToWorldPoint is used.

您需要执行Input.mousePosition;，将其z轴值手动修改为任何> 0.通常，10可以解决此问题，但是如果您不足以对其进行修改，则可以对其进行修改.之后，您可以将修改后的Vector3传递给Camera.main.ScreenToWorldPoint(mousepos)函数.

You need to do Input.mousePosition;, manually modify it's z-axis value to be anything > 0. Usually, 10 is fine for this but you can modify it if it is not enough for you. After that, you can then pass that modified Vector3 to the Camera.main.ScreenToWorldPoint(mousepos) function.

public GameObject lineprefab;
private GameObject linehandler;
private Vector3 mousepos;

void Update()
{
    if (Input.GetMouseButtonDown(0))
    {
        mousepos = Input.mousePosition;
        mousepos.z = 10;

        mousepos = Camera.main.ScreenToWorldPoint(mousepos);
        linehandler = Instantiate(lineprefab, mousepos, Quaternion.identity) as GameObject;
    }
}

OR

public GameObject lineprefab;
private GameObject linehandler;

void Update()
{
    if (Input.GetMouseButtonDown(0))
    {
        Ray rayCast = Camera.main.ScreenPointToRay(Input.mousePosition);
        linehandler = Instantiate(lineprefab, rayCast.GetPoint(10), Quaternion.identity) as GameObject;
    }
}

不相关:

我注意到您正在使用Input.GetMouseButton.您可能希望Input.GetMouseButtonDown，因为Input.GetMouseButtonDown被调用一次，直到释放键.按住Input.GetMouseButton键时反复调用Input.GetMouseButton，您可以轻松地用它创建数千个对象.

I noticed that you are using Input.GetMouseButton. You probably want Input.GetMouseButtonDown as Input.GetMouseButtonDown is called once until the key is released. Input.GetMouseButton is repeatedly called when the pressed key is held down and you can easily create thousands of objects with that.

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