What is the R-T-S Shader? It is a shader pack that attempts to simulate complex global illumination techniques. Unlike traditional shaders that rely on simple rasterization, R-T-S calculates light paths more realistically within the game engine.
Key Features Global Illumination: Light bounces off surfaces to illuminate areas without direct sunlight (such as caves or building interiors), effectively eliminating flat, pitch-black shadows.
Real-Time Ray Tracing: It calculates light paths to create soft shadows (penumbras) that change size based on the distance from the light source.
Realistic Reflections (Screen Space Reflections): Surfaces like water, metal, or polished blocks accurately reflect their surroundings, including the sky, clouds, and nearby blocks.
Dynamic Atmosphere: Features atmospheric scattering, volumetric fog, and "god rays" (light beams piercing through trees or clouds).
PBR (Physically Based Rendering) Support: It is compatible with resource packs that include normal, specular, and roughness maps, giving blocks realistic volume, shine, and texture.
Technical Requirements & Considerations To run this shader effectively, keep the following in mind:
Hardware Demands: Because Ray Tracing is computationally intensive, this shader requires a mid-to-high-end GPU to maintain a stable frame rate.
Dependencies: You must have OptiFine or, more highly recommended, Iris Shaders (paired with Sodium) installed to manage the shader files.
Optimization: Performance can be fine-tuned via the shader’s internal settings menu (Options > Video Settings > Shader Packs > Shader Options) to balance visual fidelity with performance.
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pipeline was rewritten to add a big batch of new features. Compatible with
Iris and OptiFine, Minecraft 1.20.1 and current versions.
New features
Global Illumination (screen-space approximation) + hemisphere sky/ground
ambient bounce lighting
Screen-Space Ambient Occlusion (SSAO), denoised/blurred
Real screen-space reflections (SSR) on water — reflects actual terrain,
not just a fake sky color
Volumetric fog / light shafts (ray-marched against the shadow map)
Improved water/hydrodynamics: Gerstner-style waves, shoreline foam,
rain ripples
Bloom (proper two-pass blur) + Tone Mapping (Reinhard / ACES /
Filmic) + Exposure control
Depth of Field and Motion Blur
Immersive weather: wet surfaces with rain, extra fog/ripples when raining
Celestial phenomena: aurora borealis, twinkling stars, shooting stars,
sun/moon halo
Render-distance pop-in fade ("geometry fade") to hide chunk edge culling
Visual style presets: Vibrant, Cinematic, Realistic, Nocturnal, plus the
usual quality tiers (Potato → Super Ultra)
Known issues (being worked on)
Water: reflections can still look inconsistent or "mosaic-like" over
complex geometry (waterfalls over stairs, many overlapping blocks). A fix
was applied but it's not 100% perfect yet in every scenario.
Player hand / entities / dropped items: since these are rendered
through a different pipeline stage than terrain, some post-processing
effects (motion blur, ambient occlusion) can occasionally cause them to
look slightly off (too dark, semi-transparent, or affected by leftover
data from a previous frame). Several fixes have been applied, but if you
still notice glitches specifically on the hand, mobs, or other players,
please report it with a screenshot.
Notes
This pack does not use real hardware ray tracing (RTX) — GLSL 1.20
(the language OptiFine/Iris shaders run on) doesn't support compute
shaders or BVH acceleration structures. "Ray tracing" here refers to
ray-marching techniques (SSR, volumetric light shafts), the same
approach used by other well-known Minecraft shader packs.
If you hit a shader compile error or a visual bug, a screenshot + which
profile you're using helps a lot to track it down.
Thank you so much for 300 downloads!
Changelog:
Fixed: Torch light (handheld/dynamic light) is now fully fixed and working perfectly again.
Added: Sun reflections on water! Water surfaces now realistically reflect the sun.
Note: This is a stable, full release. We are officially out of beta!
Known Issue / Bug: Torch lighting (emissive/dynamic light) is currently not working in this build.
Note: This is a beta release focused on the new shadow settings. The torch bug will be fixed in the next update
Added: Shadows are now officially implemented.
Added: You can now toggle shadows on and off in the settings.
Added: The sky is now configurable.
Fixed: Resolved several bugs related to water rendering.
Known Issues: There is currently a lighting issue when holding a torch in the hand, making it obsolete for now.
Coming Soon: We will be focusing heavily on performance optimizations for future updates.
Fixed: General bug fixes and stability improvements.
Added: Added a dynamic wind movement effect for tree leaves.
Known Issues: There are still some graphical bugs with shadow rendering that we are working to resolve.
Coming Soon: Major performance optimizations. We are aware of a recent performance drop (around 90 to 100 FPS) and are focusing on code optimization for the next update.
Fixed: Resolved an issue where the sky rendering was not displaying correctly.
Known Issues: Currently, there are some graphical glitches regarding shadow rendering. We are aware of this and working on a fix for the next update.
Coming Soon: We are working on a new settings system that will allow you to choose between different quality presets (Low, Medium, High) to optimize performance for your specific hardware.
Fixed: Resolved an issue where the sky rendering was not displaying correctly.
We’ve officially updated the R-T-S Shader to work seamlessly with Minecraft 1.20.1. Whether you're exploring the Trails & Tales features or building massive projects, your world will look better than ever with our signature ray-traced lighting and realistic reflections.
What’s new?
1.20.1 Compatibility: Perfectly integrated for the newest version.
Better Performance: We’ve tightened the code to ensure higher FPS while maintaining that cinematic look.
Visual Tweaks: Polished lighting transitions and better water transparency.
