Troubleshooting

intermediate troubleshooting

This page covers the most common issues users encounter with Radiant GI for URP and how to resolve them.

Symptom	You enabled Radiant GI settings but see no visual change in the Game view.
Cause	The Radiant Render Feature is missing from the active URP Renderer, or the Volume override is not active.
Solution	Confirm the Radiant Render Feature is added to your URP Renderer Data asset. Check that a Volume with the Radiant Global Illumination override exists in the scene and its mode is set to Global (or the camera is inside a Local volume). Verify that each parameter has its checkbox ticked (override enabled). Make sure the camera's Volume Layer Mask includes the Volume's layer. Check that the rendering path in the Renderer Feature matches your URP Renderer (e.g., Deferred in both).

Symptom	The whole scene becomes noticeably darker when Radiant GI is activated, as if direct lights were turned off.
Cause	Radiant GI automatically reduces Unity's built-in ambient lighting to avoid double-counting with GI-computed indirect light. If your scene relies heavily on ambient light, this subtraction can make the scene appear much darker.
Solution	In the Radiant GI Volume override, increase Unity Ambient Intensity towards `1.0` (default is `0.85`). A value of `1.0` keeps all Unity ambient light unchanged. Increase Indirect Light Intensity to compensate — the GI-computed bounce light replaces ambient, so stronger GI fills the gap. Check Minimum Ambient in the Fallbacks section and set it to a non-black color to guarantee a baseline illumination level. Verify your scene's Environment Lighting (Lighting window > Environment) has not been set to black — if so, restore it to appropriate values.

Symptom	Very dark objects appear whitish or brighter than expected with GI enabled.
Cause	In Forward rendering, albedo data is not available from g-buffers, so indirect light is applied more uniformly.
Solution	Switch to Deferred rendering — this provides accurate albedo/specular data and produces the most realistic results. If you must use Forward, adjust the Luma Influence setting to boost dark pixel colors.

Symptom	Indirect lighting flickers or changes noticeably when the camera moves.
Cause	Screen-space GI inherently changes when bright objects enter or leave the camera frustum.
Solution	Increase Temporal Stability to accumulate more frames. Enable one or more Fallbacks (APV/Sky, Reuse Rays, Reflection Probes) to fill gaps from off-screen objects. Reduce Indirect Light Intensity — subtle GI is less visually distracting when it changes. Use multiple Local Volumes to apply different GI settings per area.

Symptom	Geometry appears to show through the terrain when Radiant GI is active.
Cause	In Forward rendering with terrain Draw Instanced enabled, the terrain shader lacks a depth/normals pass.
Solution	Switch the camera to Deferred rendering (recommended). Or set Normals Quality to Approximated By Depth in the Radiant settings.

Symptom	Toon-shaded characters receive too much specular lighting from GI.
Cause	Specular indirect contribution is too high for stylized rendering.
Solution	Reduce the Specular Contribution setting in the Artistic Controls section, or disable specular indirect entirely.

Symptom	Visual artifacts appear when using URP's Complex Lit shader in deferred mode.
Cause	Render event timing conflict with the Complex Lit shader's deferred pass.
Solution	Select the Radiant Render Feature, set rendering path to Deferred, and change the render event to "After Rendering Deferred Lights".

Symptom	Shadow artifacts when both Radiant's Umbra and URP Screen Space Shadows are active.
Cause	Umbra handles all screen-space shadows and is incompatible with URP's built-in Screen Space Shadows Renderer Feature.
Solution	Remove the URP Screen Space Shadows Renderer Feature from your URP Renderer. Umbra will handle shadows instead.

If your issue is not covered here, please visit the Kronnect Support and post your question. The team will get back to you shortly.

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