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Temporal Anti-aliasing

Temporal anti-aliasing (TAA) is a type of supersampling that takes samples from different locations within a pixel each frame and combines them with samples from previous frames to create a supersampled image. The main challenge of TAA is knowing when samples from the previous frame are valid. TAA may cause some softness in your image, especially while in motion. To improve the quality of your image, you can enable contrast adaptive sharpening, which sharpens the details of your image. For more information, refer to Contrast Adaptive Sharpening .

Parameters

ParameterDescriptionValuesDefault
m_currentFrameContributionControls how much the current frame’s samples contribute to the final image, when history isn’t rejected. Reducing this value may help prevent flickering in some circumstances.0.1 to 1.00.1
m_clampGammaControls the number of standard deviations from the mean of the 3x3 current neighborhood that the history is clipped to. Increasing this value may prevent flickering, but can also lead to ghosting.0.0 to infinity1.0
m_maxDeviationBeforeDampeningControls the number of standard deviations from the mean, which defines a threshold for the pixel’s brightness before it begins to reduce its contribution. This prevents flickering by lowering the weight of the current pixel, if its brightness is very different from the surrounding neighborhood and history. By default, any pixel with a brightness that is more than 0.5 standard deviations from the mean begins to contribute less.0.0 to infinity0.5

Using TAA

You can enable Taa.pass in the main render pipeline through the parent pass, PostProcessParent.pass. By default, TAA is disabled. To enable it, set Enabled to true in the parent pass.

You can also add Taa.pass to a custom pipeline.