The engine also has HBAO+ support but I'm not really sure it works in the current version of the game, there's actually a couple of different options after one dumps the text strings via for example Microsoft's own Sysinternals utilities or Process Explorer specifically. [NVIDIAGameWorksSettings] NvidiaHairWorks NvidiaVXAO NvidiaHBAO NvidiaTurf NvidiaShadowLibs NvidiaFlow NvidiaAnsel NvidiaHighlights NvidiaSLI For the full thing for the NVIDIA settings. Hairworks, VXAO, TurfFX, ShadowLibs these are in-game options already. Ansel, Highlights these are likely controlled by GeForce Experience or the Ansel utility rather than the game itself. SLI, unknown but I assume it's somewhat supported depending on the driver used with the game or just a custom flag via inspector. Leaving HBAO and Flow with Flow having been a separate option but it now appears to be part of the screen effects which also affects other shaders and for HBAO it's probably part of the game engine but it might not be implemented currently or it's disabled for unknown reasons such as compatibility with the way the game renders or not being fully implemented or configured currently. For whatever reason the developers went with their custom AO instead (SSAO of some sort I assume.) and then VXAO if toggled on. I can't really be certain if HBAO works since I'm on AMD and the shadow libs are grayed out but with the right in-game areas it should be more easily comparable. Meaning chapter 3 and some grassier terrain I'm thinking. EDIT: Rooting around in the dumped text strings also provides other hits on HBAO. Black.Sequence.PostEffect.SequenceActionSetNVHBAO Black.Sequence.PostEffect.SequenceActionSetNVHBAO.BLUR_RADIUS_TYPE Black.Sequence.PostEffect.SequenceActionSetNVHBAO.DEPTH_CLAMP_TYPE .?AVSequenceActionSetNVHBAO@PostEffect@Sequence@Black@@ For VXAO there's these. Black.Sequence.PostEffect.SequenceActionSetNVVXAO Black.Sequence.PostEffect.SequenceActionSetNVVXAO.BLEND_MODE_TYPE Black.Sequence.PostEffect.SequenceActionSetNVVXAO.VOXEL_RESOLUTION_TYPE Black.Sequence.PostEffect.SequenceActionSetNVVXAO.VOXEL_DIMENSION_TYPE NVVXAO_ NVVXAO_.pinName_ NVVXAO_.name_ NVVXAO_.connections_ NVVXAO_.pinValueType_ .?AVSequenceActionSetNVVXAO@PostEffect@Sequence@Black@@ (And some voxel settings.) The pin things don't exist for HBAO though whereas they do exist for Flow, Hairworks and Shadow LIbs in addition to VXAO. Which might mean it's not currently functional but it was either planned at one point or it's coming in a later patch.