NVIDIA released RTX Remix software announced six months ago. Open source software helps add path tracing support to older games.
RTX Remix is an NVIDIA GameWorks initiative that adds path tracing to classic games for a better gaming experience on the latest GeForce RTX graphics cards. The first release of NVIDIA RTX Remix Runtime v0.1 overhauls the hashing system and geometry processing, adds new palate processing, CPU performance optimizations and a number of other improvements. NVIDIA used this method to create an RTX version of Portal, and there was also an earlier demo of RTX Remix effects in Morrowind.
You don’t need to be a rendering expert to use RTX Remix. The runtime environment and creator toolset take care of everything you need to create path tracing mods for games. RTX Remix consists of two main parts: Bridge and Renderer. Bridge uses the “interposer” d3d9.dll.
When placed next to the game executable, the library intercepts the 32-bit rendering commands and sends them to the 64-bit NvRemixBridge.exe. This translation into a 64-bit instruction set allows for virtually unlimited memory usage and better compatibility with modern ray tracing APIs.
The bridge is end-to-end, passing rendering commands to the version of d3d9.dll that includes the new renderer. Remix d3d9.dll is a complete path tracing rendering engine that takes the geometry, materials and light information built into the original d3d9 rendering commands and creates a complete game scene with enhanced lighting and other visual effects, then adding path tracing.
NVIDIA RTX Remix is available as source code as well as binaries for Windows. The program is distributed under the MIT license. You can learn more about using the open source RTX Remix on GitHub. More information about the technology is available on the NVIDIA website.
I would like to add that NVIDIA, in fact, created a mod that works on the same principle as ENB and other similar mods, but with more “thorough” rendering and support for RTX technology from the manufacturer. Of course, you will need a video card with RTX, and future mods can significantly reduce FPS. For owners of older systems and many cult games, mods have been available for a long time, which allow you to radically improve lighting and add more modern visual effects.
Source: Phoronix
