Reshade Ray Tracing Shader Rtgi 033 2021

Short story — "RTGI 033"

One of the most significant additions in the 0.33 update was support for motion vectors

  • Customization:

    Users can tweak various settings to balance between visual quality and performance. This includes options for ray tracing resolution, bounce counts, and intensity of the effect, making it versatile for different hardware configurations. reshade ray tracing shader rtgi 033 2021

    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. Short story — "RTGI 033" One of the

    Temporal Stability.

    Because it cannot see around corners (no BVH structures like RTX cards), it sometimes fails, causing "light leaks" or missing reflections. However, in 2021, version 0.33 introduced a critical improvement: Older versions flickered wildly. Version 0.33 smoothed out the noise, making it feel shockingly close to hardware ray tracing. Customization: Users can tweak various settings to balance

    • Improved Ray Marching – Fewer artifacts and more coherent light bounces compared to earlier 0.2x versions.
    • Better Performance – Optimized compute shaders allowed mid-range cards (GTX 1060 / RX 580) to run RTGI at 30–60 FPS in 1080p with moderate settings.
    • Perceptual Blur & Denoising – Reduced the characteristic “boiling” noise typical of screen-space GI, making the effect usable in motion.
    • Customizable Bounces – Users could set 1–3 light bounces; 2 bounces became the sweet spot between quality and speed.
    • Intersection Refinement – Reduced light leaking through walls and objects, a common screen-space flaw.
    • Performance Heavy: Even optimized, v0.33 can cut your FPS by 30% to 50% depending on your settings (Resolution Divisor, Step Count).
    • Screen-Space Limitations: Because it relies on the depth buffer, it doesn't know what is behind you. If you look at a wall, the light bouncing from behind you onto that wall will disappear. This creates "light leaking" or sudden lighting changes.
    • Ghosting: Fast-moving objects or cameras can leave "ghost" trails due to the temporal accumulation technique used in v0.33.

    Developer

    Below is a guide for setting up and optimizing this specific version. 1. Requirements & Access : Created by Pascal Gilcher (Marty McFly).