unityGame窗口绘制Box

原文地址： https://blog.csdn.net/amnrwlm8593/article/details/102253392/

Bounds bounds = GetComponent<BoxCollider>().bounds;

Vector3 v3Center = bounds.center - transform.position;//此处减去GameObject本身坐标是为了在物体移动时，绘制的Box也跟着一起移动

Vector3 v3Extents = bounds.extents;

原文绘制Box和BoxColider位置不匹配，修改成下这两行就好了。

Vector3 v3Center = collider.center;
Vector3 v3Extents = collider.size*0.5f;

using System;
using System.Collections.Generic;
using UnityEngine;
public class ShowBoxColider : MonoBehaviour
{
    //画线用的材质球
    Material lineMat;

    private Vector3 v3FrontTopLeft;
    private Vector3 v3FrontTopRight;
    private Vector3 v3FrontBottomLeft;
    private Vector3 v3FrontBottomRight;
    private Vector3 v3BackTopLeft;
    private Vector3 v3BackTopRight;
    private Vector3 v3BackBottomLeft;
    private Vector3 v3BackBottomRight;
    BoxCollider collider;
    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

    }

    void OnEnable()
    {
        if (lineMat == null)
        {
            lineMat = Resources.Load<Material>("Materials/LineMat");
        }
        if (collider==null)
        {
            collider = GetComponent<BoxCollider>();
        }
        CalcBoxColliderPositons(collider);
    }

    void OnRenderObject()
    {
        if (!collider.enabled)
            return;
        CalcBoxColliderPositons(collider);
        lineMat.SetPass(0);

        GL.Begin(GL.LINES);
        GL.Color(Color.red);
        GL.Vertex(v3FrontTopLeft);
        GL.Vertex(v3FrontTopRight);

        GL.Vertex(v3FrontTopRight);
        GL.Vertex(v3FrontBottomRight);

        GL.Vertex(v3FrontBottomRight);
        GL.Vertex(v3FrontBottomLeft);

        GL.Vertex(v3FrontBottomLeft);
        GL.Vertex(v3FrontTopLeft);

        GL.Vertex(v3BackTopLeft);
        GL.Vertex(v3BackTopRight);

        GL.Vertex(v3BackTopRight);
        GL.Vertex(v3BackBottomRight);

        GL.Vertex(v3BackBottomRight);
        GL.Vertex(v3BackBottomLeft);

        GL.Vertex(v3BackBottomLeft);
        GL.Vertex(v3BackTopLeft);

        GL.Vertex(v3FrontTopLeft);
        GL.Vertex(v3BackTopLeft);

        GL.Vertex(v3FrontTopRight);
        GL.Vertex(v3BackTopRight);

        GL.Vertex(v3FrontBottomRight);
        GL.Vertex(v3BackBottomRight);

        GL.Vertex(v3FrontBottomLeft);
        GL.Vertex(v3BackBottomLeft);
        GL.End();
    }

    void CalcBoxColliderPositons(BoxCollider collider)
    {
       
        Vector3 v3Center = collider.center;
        Vector3 v3Extents = collider.size*0.5f;

        v3FrontTopLeft = new Vector3(v3Center.x - v3Extents.x, v3Center.y + v3Extents.y, v3Center.z - v3Extents.z);  // Front top left corner
        v3FrontTopRight = new Vector3(v3Center.x + v3Extents.x, v3Center.y + v3Extents.y, v3Center.z - v3Extents.z);  // Front top right corner
        v3FrontBottomLeft = new Vector3(v3Center.x - v3Extents.x, v3Center.y - v3Extents.y, v3Center.z - v3Extents.z);  // Front bottom left corner
        v3FrontBottomRight = new Vector3(v3Center.x + v3Extents.x, v3Center.y - v3Extents.y, v3Center.z - v3Extents.z);  // Front bottom right corner
        v3BackTopLeft = new Vector3(v3Center.x - v3Extents.x, v3Center.y + v3Extents.y, v3Center.z + v3Extents.z);  // Back top left corner
        v3BackTopRight = new Vector3(v3Center.x + v3Extents.x, v3Center.y + v3Extents.y, v3Center.z + v3Extents.z);  // Back top right corner
        v3BackBottomLeft = new Vector3(v3Center.x - v3Extents.x, v3Center.y - v3Extents.y, v3Center.z + v3Extents.z);  // Back bottom left corner
        v3BackBottomRight = new Vector3(v3Center.x + v3Extents.x, v3Center.y - v3Extents.y, v3Center.z + v3Extents.z);  // Back bottom right corner

        v3FrontTopLeft = transform.TransformPoint(v3FrontTopLeft);
        v3FrontTopRight = transform.TransformPoint(v3FrontTopRight);
        v3FrontBottomLeft = transform.TransformPoint(v3FrontBottomLeft);
        v3FrontBottomRight = transform.TransformPoint(v3FrontBottomRight);
        v3BackTopLeft = transform.TransformPoint(v3BackTopLeft);
        v3BackTopRight = transform.TransformPoint(v3BackTopRight);
        v3BackBottomLeft = transform.TransformPoint(v3BackBottomLeft);
        v3BackBottomRight = transform.TransformPoint(v3BackBottomRight);
    }
}