Debugging ray-traced effects

The High Definition Render Pipeline (HDRP) includes the Render Pipeline Debug window, which you can use to debug and understand ray-traced effect in HDRP. To debug raytraced effects:

1. Open the debug menu, select Window > Render Pipeline > Render Pipeline Debug.
2. Select the Lighting panel.
3. Use the Fullscreen Debug Mode drop-down menu to select which ray tracing effect to debug.

Light Cluster Debug Mode: The red regions show where the number of lights per cell is equal to the maximum number of lights per cell.

Debug modes

Fullscreen Debug Mode	Description
Screen Space Ambient Occlusion	When Ray-Traced Ambient Occlusion is active, this displays the screen space buffer that holds the ambient occlusion.
Screen Space Reflection	When Ray-Traced Reflections are active, this displays the ray-traced reflections.
Transparent Screen Space Reflection	When Ray-Traced Reflections are active, this displays the ray-traced reflections on transparent objects.
Contact Shadows	When Ray-Traced Contact Shadows are active, this displays the ray-traced contact shadows.
Screen Space Shadows	When screen space shadows are active, this displays the set of screen space shadows. If you select this option, Unity exposes the Screen Space Shadow Index slider that allows you to change the currently active shadows. Area lights shadows take two channels.
Screen Space Global Illumination	When Ray-Traced Global Illumination is active, this displays a screen space buffer that holds the indirect diffuse lighting.
Recursive Ray-Tracing	When Recursive Ray Tracing is active, this displays the pixels that have been evaluated using the effect.
Ray-Traced Subsurface Scattering	When Ray-Traced Subsurface Scattering is active, this displays the subsurface lighting value for the pixels that have been evaluated using the technique.
Light Cluster	This displays the cluster using a debug view that allows you to see the regions of the Scene where light density is higher, and potentially more resource-intensive to evaluate.