Parameters

intermediate concepts

Radiant GI (Built-in) · Core Concepts

Complete reference for all Radiant GI inspector settings. Parameters are organized by section as they appear in the Volume inspector.

General Settings

Parameter	Description	Default
Indirect Light Intensity	Global intensity of the indirect lighting contribution. Keep values between 0.3 and 2 for realistic results.	1
Distance Attenuation	Controls how light intensity falls off with distance. 0 = no attenuation; 1 = inverse-square falloff.	0.5
One Extra Bounce	Reuses indirect lighting from the previous frame to simulate an additional light bounce. Low performance cost.	Off
Max Source Brightness	Clamps brightness of reflecting surfaces. Lower values (e.g., 0.2) reduce noise from emissive hotspots — compensate by increasing Indirect Intensity.	1
Normal Map Influence	Enhances GI response on surfaces with normal maps for added detail.	0.5
Luma Influence	Forward rendering only. Adds pixel brightness variation to GI. Set to 0 to disable.	0
Near Field Obscurance	Darkens surfaces based on occlusion, producing an SSAO-like effect integrated into the GI pass at no extra cost.	0
Virtual Emitters	Enables off-screen virtual light sources. See the Virtual Emitters page.	Off

Quality

Parameter	Description	Default
Ray Count	Rays per pixel (1–4). Each additional ray adds significant GPU cost. 1 is sufficient for most scenes.	1
Max Distance	Maximum ray travel distance in world units. Keep as low as possible for accuracy (e.g., room size).	8
Max Samples	Maximum steps along each ray march. Values of 24–32 give best results.	24
Jittering	Randomizes ray step size to reduce banding. Useful with low sample counts.	0.5
Thickness	Depth tolerance for surface hits. Values of 0.3–1 work best.	0.5
Binary Search	Refines hit positions for higher accuracy. Adds a small amount of GPU overhead.	On
Smoothing	Number of extra blur passes for denoising.	3
Temporal Filter	Blends current frame with history buffer using motion vectors to reduce flicker. Only active in Play mode.	On

Fallbacks

Parameter	Description
Reuse Rays	Reuses successful rays from previous frames when current rays miss. Higher values increase intensity of reused data. May cause ghosting on fast-moving objects — keep low. 0 = disabled.
Use Reflection Probes	Samples nearby reflection probe cubemaps when rays miss. Uses the 2 nearest probes to the camera.
Reflective Shadow Map	Renders the scene from the directional light to capture off-screen GI data. Expensive when updating; see the Fallbacks page for details.

Performance

Parameter	Description
Raytracer Accuracy	Downscales the input depth buffer for better GPU cache efficiency. Lower values = faster but less precise.
Downsampling	Downscales the input image for all render passes. 1 = full resolution. 2 = half. Improves performance at the cost of quality.

Artistic Controls

Parameter	Description
Brightness Threshold	Minimum pixel brightness to be considered an indirect light source. 0 = all pixels contribute.
Maximum Brightness	Clamps the maximum brightness of the GI output to prevent overexposure.
Specular Contribution	Controls how much GI is applied to metallic/shiny surfaces.
Source Brightness	Brightness multiplier for the original image.
GI Weight	Blends final GI contribution against the source color.
Saturation	Color saturation of the computed GI. 0 = grayscale.
Near Camera Attenuation	Reduces GI brightness on surfaces close to the camera.
Limit to Volume Bounds	Restricts GI to the current volume boundaries. Useful for interiors with windows.
Stencil Check	Activates stencil mask to exclude specific pixels (UI, FPS weapons) from GI.

Debug

Parameter	Description
Show In Edit Mode	Renders the effect outside Play mode. Temporal reprojection is unavailable, so results may be noisy.
Show In Scene View	Displays GI in the Scene view for preview.
Debug View	Visualizes internal buffers (depth, normals, GI, etc.) for debugging.
Compare Mode	Side-by-side or split-screen comparison with/without GI.

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