Welcome to Retro FPS Studio, the game making tool for raycasting retro fun! It produces true 2.5D, oldschool goodness alike to the original DOOM or Hexen DOS games:

Note: this public, partial copy of RFS2 is sadly NOT free software and has restrictive terms, see the license for explanations. Hopefully, you still find it informative, and I apologize that it's not more liberal.

To get started, obtain Retro FPS Studio from the website.

To get help with RFS2, visit the community spaces with other creators!

There is a technical FAQ for some basics on how RFS2 Engine works.

RFS is written in C and Lua. The core renderer, physics, and resource handling are in C for speed, while Lua handles the higher level program UI.

Here are some interesting locations:

• rfsc/ folder holds the core C engine

  • rfsc/main.c contains the program entrypoint.

  • rfsc/scriptcore.c sets up and launches the lua code.

  • rfsc/roomcam.c has the camera code, which includes perspective calculation, and calls to the 2.5D raycast renderer in rfsc/roomcamblit.c.

  • rfsc/room.h holds the lowlevel map structure definitions of the rooms.

  • rfsc/roomserialize.c takes room data from Lua's so-called tables, or dumps it back to them, for serialization of levels.

• rfslua/ folder contains the Lua UI, higher program logic, and gameplay code.

  • rfslua/rfseditor/titlescreen.lua sets up and handles the opening screen of RFS when you launch it.