An implementation of Ray Tracing in One Weekend using Taichi

Overview

又一个Taichi语言的Ray Tracer

背景简介

这个Ray Tracer基本上是照搬了Peter Shirley的第一本小书Ray Tracing in One Weekend,在我写的时候参考的是Version 3.2.3这个版本。应该比其他中文博客删改了不少内容。果然Peter Shirley不是标题党,我在国庆期间用了2号、3号两天就写完了。期间还参考了moranzcw大佬一年前的左右 (主要是抄了几个物体的定义)及其帖子下其他人的代码,在此表示感谢。

Taichi语言依附于Python,而我自己本身对Python不是那么的熟悉,更不用提Taichi了。Taichi语言的开发者带简化很多快速数值计算及并行开发的操作,但同时也增添了很多限制(比如我不知道class如何复制导致hit_record无法实现)。再加上python对OOP编程的不完全支持,我写的程序很不优雅,同时也没做足优化。

开发环境:Surface Book 2(15inch)上,使用Python 3.7.8+Taichi v0.8.1

这次写的ray tracer算是运用了太极图形课前两节除了元编程的其他所有内容,把该封装的都封装起来了。

原来以为是个小程序,所以写在了一个文件里,后来也懒得改了

与原书不同的是优化了random_in_unit_sphere()这个用来生成在单位球内随机一点的函数,在我的电脑上跑时(18fps+)与moranzcw大佬的程序(9fps+)相比大概能快一倍。(估计拥有更高配置显卡的大佬们能跑到实时吧)为此特地写了另一个程序来不同随机函数的可视化分布,顺便尝鲜了一下GGUI。

之后加入了一些键鼠操作和录制功能

除此之外还生成了一张书的封面图。不知道为什么原书中22*22个小球不能在我的电脑上生成,经过漫长的等待后,等我的只有被占用了11/15.9GB的内存,和因为使用虚拟内存而跑的飞快的硬盘,当然最后还是闪退了。

成功效果展示

封面图(有小球卡在大球里了 😂 )

Cover

Cornell Box的效果

Cornell Box 1 Cornell Box 2

来个动图
Cornell Box Gif

这是使用错误的随机函数导致的效果

Wrong Cornell Box Gif

使用方法

点击窗口来切换视点
j,k键调整水平视角
s键截图
r键开启/终止录制

整体结构

-LICENSE
-|ouput             如果开始录制的话,视频和动图会储存在这儿
-|img               示例图片
-README.MD
-raytracing.py      本体,生成一个Cornell Box
-dots_on_sphere.py  对随机化程序的可视化

运行方式

应该都安装好taichi了吧

python3 raytracing.py

还存在的问题

  • 如何优雅的ODOP编程,解决类的复制与传递
  • ti.random() 如何设置随机种子
  • 如何声明@ti.kernel中最外层循环串行
  • 如何手动释放内存

TODO(就写写,不一定会码)

  • 渲染一张封面图
  • 增加显式光源,渲染一个Cornell Box
  • 添加其他一些模型
  • 添加材质,贴图
  • 加入BVH
  • 加入三维模型.obj的读取与渲染,渲染一只Standford Rabbit
  • 增加键鼠交互
  • 跟进下一本书的内容
  • 在学习了之后的课程后,使用更多Taichi的特性
Owner
张皓
张皓
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