Spatial Denoiser Settings
Pixel Radius
Controls the spatial denoiser radius in pixels. The wider the radius, the better the noise reduction at the cost of additional blur and performance.
Radius 0: Spatial denoiser is disabled.
Radius 1: 3x3 neighborhood (9 samples).
Radius 2: 5x5 neighborhood (25 samples).
Radius 3: 7x7 neighborhood (49 samples).
Radius 4: 9x9 neighborhood (81 samples).
Performance impact: variable, depends on the radius and render resolution
Filter Strength
Controls the strictness of spatial neighbors' rejection. Higher values better preserve details, while lower values reduce noise more efficiently. Check the first two screenshots in the comparison below to see the difference between the 0 and 1 values of this parameter.
Performance impact: none
Normal Rejection
Specifies whether the difference in surface normals should be considered for spatial neighbors' rejection. Enabling this option further enhances detail preservation at the cost of performance
Performance impact: variable, depends on the pixel radius and render resolution
In these screenshots, you can see how Filter Strength and Normal Rejection work together. In the first screenshot, neither is applied. In the second screenshot, Filter Strength is set to 1.0. In the third screenshot, Normal Rejection is also enabled to achieve maximum detail preservation.
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