Creating Pseudo 3D Games With HTML 5 Canvas and Raycasting — Part 2 https://dev.opera.com/articles/3d-games-with-canvas-and-raycasting-part-2/
基本的光线投射 https://developer.mozilla.org/zh-CN/docs/Web/API/Canvas_API/A_basic_ray-caster
基于EntityFrameworkCore和Lucene.NET实现的全文检索搜索引擎