R.E.P.O. RTGI

RepoRTGI adds a configurable screen-space ray-traced global illumination pass to R.E.P.O. The renderer traces diffuse rays through the camera depth/normal buffer, accumulates indirect light over time, and applies an edge-aware bilateral denoiser.

What it does

• Colored one-bounce indirect lighting from visible scene surfaces.
• Temporal accumulation with depth rejection.
• Frame-paced temporal pixel interleaving.
• Sparse edge-aware spatial denoising.
• Low, Medium, High, Ultra, and fully Custom quality modes.
• Full bypass through the in-game mod settings.
• Conservative automatic activation only for RTX 5070-class or faster GPUs.
• Manual enable remains available for every Direct3D 11 GPU.
• Session comparison toggle (default: F8).

Automatic GPU policy

The default Automatic mode enables the effect only for the following desktop performance classes:

• NVIDIA: RTX 5070 or faster; RTX 4070 Ti / 4080 / 4090; RTX 3090 / 3090 Ti.
• AMD: RX 9070 / 9070 XT or faster; RX 7900 XTX.
• Future NVIDIA/AMD models whose parsed tier is above these thresholds.

Unknown adapters, virtual adapters, laptop-name variants that cannot be classified, and slower GPUs remain disabled in Automatic mode. Select Enabled to override the policy manually.

In-game configuration

Install REPOConfig (included as a Thunderstore dependency), then open the mod settings in R.E.P.O. Every setting is a standard BepInEx config entry:

• Mode: Automatic / Enabled / Disabled.
• Preset: Low / Medium / High / Ultra / Custom.
• Indirect-light intensity and bounce saturation.
• Internal GI resolution.
• Rays per pixel and steps per ray.
• Ray distance and depth thickness.
• Temporal stability and denoise radius.
• Temporal interleave (the number of frames over which ray work is distributed).
• Session toggle key.

Preset values are tuned as a group. Advanced values take effect only with Custom.

High is the default RTX 5070-class preset and is tuned for use alongside REPOFidelity. Every preset, including Ultra, distributes ray work across frames to avoid a single full-trace frame-time spike. If another graphics mod still causes sustained GPU pressure, select Medium.

Compatibility

• Client-side only; it does not alter networking or game state.
• Requires the Windows Direct3D 11 renderer.
• If the game was forced to Direct3D 12 or Vulkan, add -force-d3d11 to the R.E.P.O. launch options.
• Other mods that replace the main camera image pipeline may conflict.
• REPOFidelity can be used alongside this mod. RTGI copies its temporary DLSS inputs into stable Unity textures before invoking the native renderer.
• VR is intentionally bypassed unless the VR mod still exposes a conventional main-camera image effect path.

Installation

Use a Thunderstore-compatible mod manager. Manual installation is also possible:

1. Install BepInEx 5 and REPOConfig.
2. Copy RepoRTGI.dll and RepoRTGI.Native.dll into the same folder under BepInEx/plugins/.
3. Launch the game once and edit BepInEx/config/ModsForGames.RepoRTGI.cfg if you do not use REPOConfig.

Technical note

R.E.P.O. is not an HDRP game. HDRP's hardware DXR global-illumination override cannot be injected into a built game without replacing its render pipeline and materials. This mod therefore implements RTGI as screen-space ray tracing over the current frame's color, depth, and normal buffers. It is dynamic and ray-marched, but—like every screen-space technique—it cannot bounce light from geometry that is fully outside the camera view.

Changelog

1.2.0

• Fixed the black frame caused by caching a transient REPOFidelity/DLSS native texture pointer.
• Added persistent Unity-owned source and depth-normal copies, eliminating GetNativeTexturePtr from the per-frame path without retaining external resources.
• Added a native source-frame fallback for D3D11 view or renderer failures and automatic safe bypass after an error.
• Moved all HLSL compilation to the package build and embedded precompiled DXBC in the DLL, removing the first-render shader compilation hitch.
• Expanded temporal work distribution to 2-8 phases and enabled it for every preset, including Ultra.
• Retuned Ultra from 0.75 scale, 3×28 rays/steps without interleaving to 0.66 scale, 2×18 with two phases.
• Reduced repeated XR subsystem queries and render-camera reflection work.
• Added a regression test that reproduces D3D11 CreateShaderResourceView error 0x80070057 and verifies a non-black fallback frame.

1.1.0

• Removed five per-frame GetNativeTexturePtr calls that could synchronize Unity's main and render threads.
• Cached stable D3D11 shader-resource and render-target views instead of recreating them every frame.
• Removed a redundant full-screen fallback copy from the successful render path.
• Added temporal pixel interleaving to distribute ray-marching work evenly across frames and improve frame-time consistency.
• Replaced the square bilateral denoiser kernel with a sparse cross kernel, reducing its radius 1/2/3 tap counts from 9/25/49 to 5/9/13.
• Avoided decoding ray-step normals until a potential geometry hit is found.
• Retuned every quality preset for substantially lower peak GPU cost, especially when stacked with REPOFidelity.
• Added a configurable Temporal Interleave option to the Custom preset.

1.0.0

• Initial release.
• Added D3D11 screen-space diffuse ray tracing.
• Added temporal accumulation with depth-based history rejection.
• Added edge-aware spatial denoising.
• Added four tuned presets and a custom quality mode.
• Added REPOConfig-compatible in-game settings.
• Added conservative RTX 5070-class automatic GPU activation.
• Added a full bypass mode and an F8 session comparison toggle.