Temporal Denoising
This page describes parameters under the "Temporal" foldout that are specific to GTAO mode.
Reprojection Filter
Defines a reprojection filter used for temporal history fetch. Linear is fast but introduces blur, while Bicubic is slower but much sharper. This option affects only the sharpness of the reprojection, not its effectiveness.
The filter is applied only to the history, meaning the sharpening effect will be visible during motion. It isn't a general-purpose sharpening effect (like CAS) and will have no impact on the stationary image.
Performance impact: moderate, activate only if necessary
Performance impact: moderate
Rejection Threshold
Controls the strictness of temporal history rejection, depending on the selected Rejection Mode. In Simple mode, this threshold applies to the entire frame; otherwise it applies only to occlusion cast from and onto moving objects.
Performance impact: none
Use Simple Rejection
Switches temporal rejection to a simplified mode that uses a TAA-like color clamping mechanism across the entire frame. It saves performance, the Rejection Threshold parameter is applied to every pixel and does not distinguish between dynamic and static AO areas. When disabled, a more advanced algorithm is used — the temporal denoiser can detect pixels with moving occlusion and selectively reject them based on velocity and other characteristics.
Performance impact: beneficial
Use Normal Weighting
Specifies whether the difference in surface normals should be considered during temporal history reprojection. This option can mitigate reprojection artifacts (such as the one shown in the screenshot below) where occlusion from one surface leaks onto an unoccluded surface. Such artifacts typically occur on small, irregular geometry.
Performance impact: small
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