Reshade Ray Tracing Shader Rtgi 033 2021 -
Do not use the standard ReShade installer for RTGI. You need the specific shader repository.
The ReShade ray tracing shader RTGI 0.33 (2021) was not just a mod; it was a movement. It proved that with clever coding, real-time global illumination was possible without $1,200 graphics cards or developer support.
While hardware ray tracing has since become mainstream (with UE5’s Lumen and RTX Remix), there is a certain charm to forcing a 2012 game like Dishonored to compute light bounces using a screen-space shader from 2021. It feels like hacking reality.
If you have an old game in your Steam library with dated lighting, download ReShade 4.9, find an archive of RTGI 0.33, and witness the magic of software-based path tracing. The frame rate may drop, but the immersion will skyrocket.
Have you used RTGI 0.33 in your favorite retro game? Share your results and custom settings in the comments below. And stay tuned for our upcoming guide on RTGI 1.5 vs. 0.33 performance shootout.
ReShade Ray Tracing: Unlocking Next-Gen Visuals with RTGI 0.33 (2021)
The year 2021 was a transformative era for PC gaming graphics, largely due to the widespread adoption of the ReShade Ray Traced Global Illumination (RTGI) shader. Developed by Pascal Gilcher (also known as Marty McFly), the RTGI shader version 0.33 represented a pinnacle of post-processing technology, allowing gamers to inject sophisticated lighting effects into almost any title—even those released long before the hardware ray tracing era. What is the RTGI Shader? reshade ray tracing shader rtgi 033 2021
The ReShade RTGI shader is a post-processing effect that simulates Ray Traced Global Illumination. Unlike traditional baked lighting, RTGI facilitates real-time interactive "bounce lighting," where light reflects off surfaces to illuminate areas not directly hit by a primary light source. Key benefits of the 0.33 version include:
Dynamic Lighting: Adds realistic shadow casting and material interaction that adapts to the in-game environment.
Hardware Independence: Unlike native RTX implementations, RTGI operates solely on depth data, making it compatible with non-RTX video cards.
Temporal Stability: Minimized flickering and lag, providing a smoother visual experience compared to earlier versions.
Motion Vectors: One of the most significant updates in the 0.33 release was the addition of motion vectors, which drastically improved the accuracy of lighting during fast movement. Key Features of Version 0.33 (2021)
The 2021 release of RTGI 0.33 brought several refinements that bridged the gap between offline rendered images and real-time gaming. Do not use the standard ReShade installer for RTGI
Enhanced Denoising: Improved algorithms to reduce the "noise" often associated with ray tracing, leading to a cleaner image.
Immersive Launchpad Integration: Best used with the "Launchpad" pre-pass shader, which provides motion estimation using optical flow for more precise lighting updates.
Specular Global Illumination: Accurate modeling of both diffuse and specular light, ensuring that shiny surfaces reflect the environment correctly. How to Install and Optimize RTGI 0.33
Using RTGI requires a standard ReShade installation and access to Pascal Gilcher's shader files.
If you are digging through 2021 archives, you want to know which games looked best.
| Aspect | RTGI v0.33 | DXR / Vulkan RT (2021) |
|--------|------------|-------------------------|
| Hardware acceleration | No | Yes (RT cores) |
| Scene data | Depth + normal buffer only | Full BVH + geometry |
| Off-screen rays | No | Yes |
| Multi-bounce | 1 (simulated) | Unlimited (physically based) |
| Transparency/Reflections | No | Yes |
| Cost | Free (shader mod) | $300+ GPU required | Have you used RTGI 0
To understand the hype around the "ReShade ray tracing shader RTGI 033 2021" search query, you have to look at the GPU market at that time.
A common misconception in 2021 was that RTGI 0.33 was "true" hardware ray tracing like NVIDIA’s RTX. It is not.
The Implication: If a light source exists just outside your camera view, RTGI 0.33 cannot bounce light from it. However, within the confines of the visible frame, the shader does an astonishing job of calculating indirect bounce lighting.
This screen-space limitation is why moving your camera quickly can cause light to "pop" in or out—a flaw tolerated by most users given the zero cost to developers and the lack of native RT support.
How does the 2021 build hold up against today's "Martyan" or "qUINT" shaders?
For most retro-fitting, version 0.33 remains the best "entry level" ray tracing mod. It hits the sweet spot of visual impact versus computational cost.
