I'm creating a RayCasting tutorial on github (click here to access it) and I'm following a lot of tutorials, implementations and other render methods in the web. One game made with it is the "Prelude of the Chambered" by Markus Persson. He made this game in 2 days with native programming.
My question is about the noise picture effect he used for rendering. I wanted to know how to do this, and if this has some render name. Check the image bellow and you will know what I'm speaking about:
If you check some render position you will find some noise pixels. What is the method to do this? This techique has some name?
Thanks a lot for help!