There is a great tutorial (it&#x27;s actually a series of them) which I used: <a href="http:&#x2F;&#x2F;lodev.org&#x2F;cgtutor&#x2F;raycasting.html" rel="nofollow">http:&#x2F;&#x2F;lodev.org&#x2F;cgtutor&#x2F;raycasting.html</a><p>It&#x27;s old and C++ but explains raycasting very well.<p>And there is also a similar project in just 265 JS lines: <a href="http:&#x2F;&#x2F;www.playfuljs.com&#x2F;a-first-person-engine-in-265-lines&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.playfuljs.com&#x2F;a-first-person-engine-in-265-lines&#x2F;</a>