Unity Bound_unity中的bound

Bound：包围盒，边界框，AABB的简称，Mesh，Collider，Renderer都存在bound。（Mesh返回的是自身坐标，其余返回的是世界坐标）。

using UnityEngine;
using System.Collections;
using System.Xml;
 
public class TestXml : MonoBehaviour {
 
    public GameObject Target;
 
    public GameObject Target2;
 
    Bounds bounds;
 
    void Start()
    {
        bounds = Target.GetComponent<BoxCollider>().bounds;
 
        Debug.Log("center:" + bounds.center);//中点
        Debug.Log("Size:" + bounds.size);//bound的大小，等于extents*2
        Debug.Log("Min:" + bounds.min);//bound上最小的点，总是等于center-extents
        Debug.Log("Max:" + bounds.max);//bound上最大的点，总是等于center+extents
        Debug.Log("extents:" + bounds.extents);//圣典上翻译成广度，笔者也不清楚如何理解，它等于size/2
 
        //传入一个点，找离bounds最近的点，如果点在bounds上，则返回输入的点
        Debug.Log(bounds.ClosestPoint(bounds.center));
        Debug.Log(bounds.ClosestPoint(bounds.min));
        Debug.Log(bounds.ClosestPoint(Vector3.zero));
 
        //判断点是否在bounds上
        Debug.Log(bounds.Contains(bounds.center));
        Debug.Log(bounds.Contains(bounds.min));
        Debug.Log(bounds.Contains(Vector3.zero));
 
        Bounds temp = new Bounds(Vector3.zero, Vector3.one * 3);
 
        bounds.Encapsulate(Vector3.one);//使bound包含这个点
 
        bounds.Encapsulate(temp);//使bound包含参数bound
 
        bounds.Expand(Vector3.one * 2);//扩大包围盒
 
        bounds.SetMinMax(Vector3.zero, Vector3.zero);//设置最大最小点，且比单独设置min，max效率要高
 
        Debug.Log(bounds.Intersects(temp));//是否与参数包围盒相交
 
        Debug.Log(bounds.SqrDistance(Vector3.up * 2));//返回一个参数点与bound最近的距离平方;
    }
 
    bool DetectHit(Ray ray)
    {   
       //判断射线是否在bound上
        return bounds.IntersectRay(ray);
    }
 
    void Update()
    {
        if (Input.GetMouseButtonDown(0)) {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (DetectHit(ray))
            {
                Debug.Log("点中包围盒");
            }
            else {
                Debug.Log("没有点中");
            }
        }
    }
}

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