Ray-traced ambient occlusion (RTAO) is an alternative to screen space ambient occlusion that's more accurate because it uses off-screen data.
A single-channel occlusion texture of a gothic corridor. The screen space ambient occlusion texture on the left has fewer details and lighter shadows than the ray-traced ambient occlusion texture on the right.
Follow these steps:
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Set up ray tracing in your HDRP project.
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Select the GameObject with the volume override you created in step 1.
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In the Inspector window of the Screen Space Ambient Occlusion override, enable Ray Tracing.
To control the effect, refer to the Ray-traced properties on the Ambient occlusion reference page.
To troubleshoot ray-traced ambient occlusion, HDRP provides an Ambient Occlusion Debug Mode and a Ray Tracing Acceleration Structure Debug Mode in Lighting Full Screen Debug Mode.
- Assign an ambient occlusion texture for each GameObject.
- Screen space ambient occlusion (SSAO), which uses information from the whole screen.