This page describes parameters under the "Visuals" foldout that are specific to GTAO mode.
World Space Radius
Defines the maximum distance in meters for occluder search.
For HDRP this corresponds to the Radius of the SSAO override.
For URP this corresponds to the Radius of the native SSAO renderer feature.
Performance impact: moderate
Screen Space Radius
Defines the maximum occluder search radius in pixels. Useful for preserving GTAO visibility at distance, where its world-space radius naturally shrinks due to perspective. GTAO automatically uses whichever radius is larger — world-space or screen-space — on a per-pixel basis, ensuring the search area never falls below the specified screen-space minimum.
Exclude Casting
Excludes objects from casting AO on a per-layer basis via the Rendering Layer Mask. This feature works by clearing the pixels of excluded objects from the local Depth Buffer used by HTrace AO (while leaving Unity's original Depth Buffer intact).
Keep in mind that excluding objects does not make other objects behind them visible to screen-space rays, since this operation only erases data from the Depth Buffer but cannot restore the information behind the excluded areas.
