ZenRT – Global Illumination shader

and Ambient Occlusion shader

to Any Game with ReShade

Add Realistic Lighting and Shadows

Zenteon+: ZenRT is a global illumination shader and ambient occlusion shader that brings real-time ray traced lighting to your favorite DX10+ games. It uses screen space data to simulate indirect lighting, ambient shadows, and light bounces, without requiring expensive hardware and being reasonable on performance.

What is Zenteon+: ZenRT?

ZenRT is a powerful screen space ray tracing shader designed for real-time post-processing in ReShade. It adds global illumination and ambient occlusion to any supported game, adding realistic simulated lighting. You'll see soft shadows in corners, light bouncing off surfaces, and a general ambiance that feels natural and immersive.

Unlike traditional ray tracing, which is often quite slow, ZenRT is built for speed. It uses a slice-based ray tracing method that sends up to 32x the rays per pixel using visibility bitmasks. This gives you high-quality indirect lighting and ambient occlusion, at nearly six times the quality of older screen space methods.

To keep your visuals clean and smooth, ZenRT includes a modified SVGF denoiser that removes noise and flicker, and a temporal feedback system lets light bounce across your scene a nearly infinite amount of times, helping everything look more connected and filling difficult to reach areas with light.

Why Use Zenteon+: ZenRT?

ZenRT is made for gamers and modders who want modern lighting in older games. Whether you're building cinematic scenes, enhancing immersion, or just making your game look better, ZenRT gives you the tools to do it.

It’s especially useful for users with mid-range hardware. ZenRT runs at just ~6ms on an RTX 3050 laptop GPU with medium settings, making it one of the fastest global illumination and ambient occlusion shader combos available through ReShade.

It integrates directly with Zenteon: Framework—just install, enable, and go.

Key Features

Real-Time Screen Space Ray Tracing

Delivers global illumination and ambient occlusion using a fast slice-based model with visibility bitmasks.

Smart Denoising

A custom SVGF filter smooths out noisy shadows and reduces flicker during motion.

Infinite Light Bounces

A temporal feedback loop allows indirect light to bounce naturally, simulating how light moves in the real world.

32 Times The Rays Per Pixel

Traces up to 32 rays at the same time, offering detailed lighting and realistic indirect light response.

Optimized for Performance

ZenRT is tuned to run fast on common GPUs, bringing ray-traced-like effects to more players without the need for ray tracing hardware.

Built for Better Lighting

ZenRT improves lighting in any game by simulating how real light behaves. With ambient occlusion and global illumination, scenes gain depth, softness, and a more polished look. It works by using screen space data to estimate where light should bounce and how much indirect light fills a scene.

The result? Brighter spaces feel more open, and darker corners feel grounded, without needing baked lighting or traditional ray tracing engines. It’s perfect for screenshots, immersive gameplay, or enhancing mods.

Installation Guide

Download ZenRT from our website or Patreon.

  1. Install ReShade if you haven’t already.

  2. Add ZenRT to your ReShade shader folder.

  3. Launch your game, enable ZenRT in the shader list.

  4. Tweak your quality and intensity settings.

Need help? Check out our installation guide for step-by-step instructions.

FAQs

  • Nope! ZenRT works on any somewhat modern GPU. It's optimized to run well even on lower mid-range systems.

  • Yes. It adds ambient occlusion and global illumination—all in real time.

  • ZenRT uses screen space ray tracing. It’s not full path tracing, but it gives you limited ray traced effects using your existing setup.

  • ZenRT provides higher quality than many screen space solutions, with better efficiency and a focus on performance. It’s one of the fastest ReShade-based global illumination shaders available.

Try Zenteon+: ZenRT Today

Want realistic light and ambient shading without a major performance hit? Zenteon+: ZenRT delivers high-quality global illumination and ambient occlusion using fast screen space ray tracing. If you’re ready to level up your lighting, ZenRT is your next must-have shader.