Ever wished a simulator level could break its own rules? That is the gap this project fills: a mod that drops a flyable FPV quad straight into Portal 2, letting pilots thread the game's portals with a drone instead of walking through them as a test subject. The idea reportedly came from the maker's friends, and the result looks like a genuinely new way to fly a line through a familiar map.
Under the hood, the mod runs on the maker's libfpv framework, which embeds a drone simulator into different games. It uses the SimITL flight engine with embedded Betaflight code, both patched for the project. The flight is said to feel the same as on a free simulator site the maker named. One detail I really rate: libfpv mods share a config directory, so radio bindings and rates carry across games with no rebinding needed. That shared setup came from a contributor's pull request, a nice bit of community input.
Several touches stand out to me. A stand-in pilot is moved invisibly to the drone's position, which keeps enemies targeting it and sidesteps LOD trouble. The patched SimITL and Betaflight code draws GPS elements on the OSD, turtle mode works, and Betaflight threads restart when switching between compatible drone presets so rendering stays correct. Radio bindings can also be tied to game actions, so objects in the world can be interacted with. In the footage the quad sails through gravity loops, with smoothed camera rotations in ANGL mode showing in the bottom right corner.
The open question is coverage: only one test chamber has been tried so far, and finishing the whole game as a drone seems plausible but remains untested. Steam Workshop is not an option since Portal 2 does not allow it, though a downloadable release build has since landed on the repository.