向一个对象添加力会向所有附加脚本的对象添加力答案

【问题标题】：Adding force to one object adds force to all objects with script attached向一个对象添加力会向所有附加脚本的对象添加力
【发布时间】：2015-05-09 08:24:35
【问题描述】：

我编写了一个脚本，仅当鼠标在对象上时才在 y 轴上上下移动对象。我正在使用光线投射，我可以使用名称并区分每个对象。但是，当我尝试在光线投射时添加力时，所有带有脚本的对象都会移动。有谁知道这是为什么？

    using UnityEngine;
using System.Collections;

public class BlockMove : MonoBehaviour
{

    private bool dragOccuring = false;
    private Vector3 lastMousePosition = Vector2.zero;
    private float amountToMove = 0;

    // Use this for initialization
    void Start ()
    {

    }

    // Update is called once per frame
    void Update ()
    {
        Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        RaycastHit hit;
        if (Input.GetMouseButtonDown (0) == true) {
            dragOccuring = true;
            if (Physics.Raycast (ray, out hit)) {
                print (hit.collider.gameObject.name);
                lastMousePosition = Input.mousePosition;

            }

        } else if (Input.GetMouseButton (0) == true) {
            ray = Camera.main.ScreenPointToRay (Input.mousePosition);

            if (Physics.Raycast (ray, out hit)) {
                print (hit.collider.gameObject.name);

                Vector3 mousePosition = Input.mousePosition;
                Rigidbody rigidbody = GetComponent<Rigidbody> ();

                if (lastMousePosition.y > mousePosition.y){
                    rigidbody.AddForce (0, -Input.mousePosition.y, 0);
                } else if (lastMousePosition.y == mousePosition.y){
                    rigidbody.AddForce (0, 0, 0);
                }
                else{
                    rigidbody.AddForce (0, Input.mousePosition.y, 0);
                }

                lastMousePosition = mousePosition;
            }
        } else if (Input.GetMouseButtonUp (0) == true) {
            dragOccuring = true;
            lastMousePosition = Vector3.zero;
        }
    }
}

【问题讨论】：

标签： c# unity3d

【解决方案1】：

您似乎忘记将光线投射命中的对象与脚本游戏对象进行比较。没有这个，当你点击屏幕上的一个对象时，所有附加了这个脚本的对象都会移动。

尝试将您的第二个 if 块更改为类似

} else if (Input.GetMouseButton (0) == true) {
    ray = Camera.main.ScreenPointToRay (Input.mousePosition);

    if (Physics.Raycast (ray, out hit)) {
        print (hit.collider.gameObject.name);

        // If this is the clicked object
        if(hit.collider.gameObject == gameObject){
            Vector3 mousePosition = Input.mousePosition;
            Rigidbody rigidbody = GetComponent<Rigidbody> ();

            if (lastMousePosition.y > mousePosition.y){
                rigidbody.AddForce (0, -Input.mousePosition.y, 0);
            }else if (lastMousePosition.y == mousePosition.y){
                rigidbody.AddForce (0, 0, 0);
            }else{
                rigidbody.AddForce (0, Input.mousePosition.y, 0);
            }
        }
        lastMousePosition = mousePosition;
    }
} else if ...

您甚至可以做得更好，并在您的脚本中更早地检查这一点，这样您的函数将更快地结束未单击的对象。

【讨论】：