Lib.rs

I've been learning graphics those days. And I found ray tracing in one weekend. I don't have the whole weekend, so I just read it whenever I have freetime. the examples just the main function codes in every chapter. I use git to store every chapter's code once. just like a homework for ray tracing in one weekend.

学光追的时候跟着ray tracing in one weekend 写的，整体代码逻辑跟原文差不多，为了适应rust的规范做了些许修改。权当是交作业。 之后还会继续跟着后面的两本书学下去。 每一章的代码需要回退到对应章节的提交才能正确的运行。