Nvidia’s RTX Remix is a remarkable tool that allows game modders to bring state-of-the-art path traced visuals to classic PC games. We’ve seen Portal RTX from Nvidia already, along with the development of a full-on remaster of Half-Life 2 – but I was excited to see a community of modders take on 2004’s Painkiller, enhanced now to become Painkiller RTX. It’s still a work-in-progress project as of version 0.1.6, but what I’ve seen so far is still highly impressive – and if you have the means, I recommend checking it out.
The whole reason RTX Remix works with the original Painkiller is due to its custom rendering technology, known as the PainEngine. This 2004 release from People Can Fly Studios was built around Direct X 8.1, which gave it stellar visuals at the time, including bloom effects – specular lighting with limited bump mapping and full framebuffer distortion effects. Those visuals dazzled top-end GPU owners of the time, but like a great number of PC releases from that era, it had a DX7 fallback which culled the fancier shading effects and could even run on GPUs like the original GeForce.
RTX Remix uses the fixed function DX7 path and replaces the core rendering with the path tracer – and that is how I have been playing the game these last few days, taking in the sights and sounds of Painkiller with a new lick of paint. It’s an upgrade that has made me appreciate it all the more now in 2025 as it is quite a special game that history has mostly forgotten.
Painkiller is primarily a singleplayer first-person shooter that bucked the trends of the time period. After Half-Life and Halo: Combat Evolved, many first person shooters trended towards a more grounded and storytelling-based design. The classic FPS franchises like Quake or Unreal had gone on to become wholly focused on multiplayer, or else transitioned to the storytelling route – like Doom 3, for example. Painkiller took all of those ‘modern’ trappings and threw them in the garbage. A narrative only exists in a loose sense with pre-rendered video that bookends the game’s chapters, acting only as a flimsy excuse to send the player to visually distinct levels that have no thematic linking beyond pointing you towards enemies that you should dispatch with a variety of weapons.