本文介绍，在Unity3D中，如何将Debug.Log()的信息输出到屏幕窗口上。
1.新建一个cs脚本：ConsoleToScreen.cs，
2.写入以下内容：

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

/// <summary>
/// 用于把Debug.Log的信息输出到游戏窗口中
/// </summary>
public class ConsoleToScreen : MonoBehaviour
{
    
    
    /// <summary>一页展示多少行</summary>
    private const int maxLines = 50;
    /// <summary>一行有多少个字</summary>
    private const int maxLineLength = 80;
    /// <summary>输出的字体大小</summary>
    private const int fontSize = 20;
    /// <summary>字体颜色</summary>
    private readonly Color fontColor = Color.red;

    private string _logStr = "";
    private readonly List<string> _lines = new List<string>();

    void OnEnable() {
    
     Application.logMessageReceived += Log; }
    void OnDisable() {
    
     Application.logMessageReceived -= Log; }

    public void Log(string logString, string stackTrace, LogType type)
    {
    
    
        foreach (var line in logString.Split('\n'))
        {
    
    
            if (line.Length <= maxLineLength)
            {
    
    
                _lines.Add(line);
                continue;
            }
            var lineCount = line.Length / maxLineLength + 1;
            for (int i = 0; i < lineCount; i++)
            {
    
    
                if ((i + 1) * maxLineLength <= line.Length)
                {
    
    
                    _lines.Add(line.Substring(i * maxLineLength, maxLineLength));
                }
                else
                {
    
    
                    _lines.Add(line.Substring(i * maxLineLength, line.Length - i * maxLineLength));
                }
            }
        }
        if (_lines.Count > maxLines)
        {
    
    
            _lines.RemoveRange(0, _lines.Count - maxLines);
        }
        _logStr = string.Join("\n", _lines);
    }

    private void OnGUI()
    {
    
    
        GUI.matrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity,
           new Vector3(1f, 1f, 1.0f));
        GUI.Label(new Rect(10, 10, 600, 370), _logStr, new GUIStyle() {
    
     fontSize = Math.Max(10, fontSize), normal = new GUIStyleState() {
    
     textColor = fontColor } });
    }
}

有四个参数可以设置：maxLines、maxLineLength、fontSize、fontColor。
3.将脚本随便挂到一个场景中的物体上就好了。