An implementation of Ray Tracing in One Weekend using Taichi

Last update: Nov 21, 2022

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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 😂 )

Cornell Box的效果

来个动图

这是使用错误的随机函数导致的效果

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

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Comments

优秀作业中奖～快来联系我们哦

Hi 0xrabbyte 恭喜你在本周太极图形课的直播抽奖环节中奖！快来将收件地址发给小编，太极周边将会快马加鞭向你飞奔而来～小编的邮箱是：[email protected] 快递预计将会在下周五前发放完毕哦～再次感谢你对图形课的支持，也为你的优秀作业点赞👍

太极图形课小编 2021.11.12

opened by taichiCourse01 0
TypeError: unsupported operand type(s) for -: 'SNodeHostAccess' and 'float'

[Taichi] version 0.8.1, llvm 10.0.0, commit cc2dd342, win, python 3.8.13 [Taichi] Starting on arch=cuda 2527 Generated Objects Traceback (most recent call last): File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 970, in build_bvh_tree(0, world.objects) File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 508, in build_bvh_tree build_bvh_tree(bvh_tree[u].left, objs[:mid]) File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 508, in build_bvh_tree build_bvh_tree(bvh_tree[u].left, objs[:mid]) File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 508, in build_bvh_tree build_bvh_tree(bvh_tree[u].left, objs[:mid]) [Previous line repeated 9 more times] File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 512, in build_bvh_tree is_hit, box_a = get_bounding_box(objs_id[bvh_tree[u].left], bvh_tree[u].time0, bvh_tree[u].time1) File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 313, in get_bounding_box return sphere(sphere_centers[objs_ind[id]], sphere_radius[objs_ind[id]], File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\kernel_impl.py", line 99, in decorated return fun.call(*args) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\kernel_impl.py", line 135, in call return self.func(*args) File "E:/files/作业/计算机图形学/TinyRayTracer-Taichi/raytracing.py", line 584, in bounding_box return True, AABB(self.center - ti.Vector([self.radius, self.radius, self.radius]), File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\common_ops.py", line 24, in sub return ti.sub(self, other) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\ops.py", line 74, in wrapped return a.element_wise_binary(imp_foo, b) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\matrix.py", line 159, in element_wise_binary ret.entries[i] = foo(self.entries[i], other.entries[i]) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\ops.py", line 63, in imp_foo return foo(x, y) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\ops.py", line 441, in sub return _binary_operation(_ti_core.expr_sub, _bt_ops_mod.sub, a, b) File "D:\software\Anaconda\envs\master\lib\site-packages\taichi\lang\ops.py", line 176, in _binary_operation return python_op(a, b) TypeError: unsupported operand type(s) for -: 'SNodeHostAccess' and 'float'

opened by 13253591602 1

Owner

张皓

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