Subsurface Scattering

Translucency Options#

Translucent Color	The color multiplier for the albedo color of translucent materials.

Customizable Settings#

The following settings are available when the Custom preset is selected.

SSS custom settings

Subsurface Scattering Settings

Diffuse

Toggles the SSSSS calculation for diffuse lighting (directional lights) on and off.

Notice

Disable this option, when it is not needed, to save performance.

Ambient

Toggles the SSSSS calculation for ambient lighting (environment) on and off.

Notice

Disable this option, when it is not needed, to save performance.

Quality

Quality of the subsurface scattering:

Low — low quality.
Medium — medium quality.
High — high quality.
Ultra — ultra quality.

Quality = Low

Quality = Ultra

Resolution

Resolution used for the subsurface scattering:

Quarter — quarter resolution.
Half — half resolution.
Full — full resolution.

Noise Ray

Intensity of the ray noise used for SSSSS calculation to reduce banding artifacts of tracing: higher values make banding less visible.

Noise Step

Intensity of the step noise used for SSSSS calculation to reduce banding artifacts of tracing: higher values make banding less visible.

Interleaved Rendering Options#

Enabled	Toggles interleaved rendering mode for the SSSSS effect on and off. This option enables rendering of the effect in only half or quarter of all pixels with subsequent reconstruction of neighboring pixels using the data from previous frames, significantly improving performance. The effect is cumulative and works best with Temporal Filter (see below), which reduces ghosting and noise artifacts.
Samples	Defines the number of pixels to be skipped when rendering the SSSSS effect with subsequent reconstruction of neighboring pixels using the data from previous frames: 1 x 2 — half of all pixels is rendered skipping each second line 2 x 2 — quarter of all pixels is rendered skipping each second line and row
Color Clamping	Color clamping mode used to reduce ghosting effect: higher values increase clamping intensity, but may cause flickering (to reduce flickering you can choose High + Velocity). When disabled, translucency has a lag as it is several frames behind.

Enabled

Toggles interleaved rendering mode for the SSSSS effect on and off. This option enables rendering of the effect in only half or quarter of all pixels with subsequent reconstruction of neighboring pixels using the data from previous frames, significantly improving performance.

The effect is cumulative and works best with Temporal Filter (see below), which reduces ghosting and noise artifacts.

Samples

Defines the number of pixels to be skipped when rendering the SSSSS effect with subsequent reconstruction of neighboring pixels using the data from previous frames:

1 x 2 — half of all pixels is rendered skipping each second line
2 x 2 — quarter of all pixels is rendered skipping each second line and row

Color Clamping

Color clamping mode used to reduce ghosting effect: higher values increase clamping intensity, but may cause flickering (to reduce flickering you can choose High + Velocity). When disabled, translucency has a lag as it is several frames behind.

Temporal Filtering Options#

Fix Flicker	Removes bright pixels by using the pixel brightness information from the previous frame. We recommend to enable this option for bright thin ropes, wires, and lines. However, when enabled, may produce artifacts by removing small bright objects. Notice Can be controlled by render_sssss_taa_fix_flicker console command.
Frames By Color	Toggles accumulation of a variable number of frames over time depending on the pixel color difference between the current and previous frames on and off. If the pixel color in the current frame differs from the pixel color of the previous frame a lot, these frames aren't combined and blended during TAA. When enabled the image becomes more sharp but it may produce additional flickering, thin objects may be blurred (e.g. grass, metal structures, wires, etc.). Disabling this option may result in more noticeable ghosting effect. Notice Can be controlled by render_sssss_taa_frames_by_color console command.
Fix Blur	Toggles Catmull-Rom resampling on and off. The option allows you to reduce image blurring when the camera moves forward/backward. It is recommended to disable resampling at low settings. Notice Can be controlled by render_sssss_taa_catmull_resampling console command.
Antialiasing In Motion	Toggles improved anti-aliasing in motion (for moving camera and objects) on and off. Notice Can be controlled by render_sssss_taa_antialiasing_in_motion console command.
Preserve Details	Controls the TAA detail level: the higher the value, the more detailed the image is. At the value of 0, the image becomes blurred when moving the camera, however, the TAA effect is better. At high values, this option may produce additional flickering. Thus, to improve the anti-aliasing effect, you can decrease the value; to minimize blurring — increase it. Notice Can be controlled by render_sssss_taa_preserve_details console command.
Frame Count	Specifies the number of frames that are combined and blended during TAA calculation. The higher the value, the more frames are combined into the final image and the better anti-aliasing is. Notice This value is used only when Frames By Velocity option below is disabled. Can be controlled by render_sssss_taa_frame_count console command.

Frames By Velocity

Enabled	Toggles accumulaton of a variable number of frames over time depending on the pixel velocity difference between the current and previous frames on and off. Reprojection of pixels of the previous frame is performed taking into account the velocity buffer and the result is combined with pixels of the current frame. This option reduces blurring and ghosting in dynamic scenes with a lot of moving objects. Notice Can be controlled by render_sssss_taa_frames_by_velocity console command.
Threshold	Specifies the threshold value defining sensitivity to velocity change (velocity threshold at which pixels are treated as fast moving).
Max Frame Count	Sets the number of frames combined and blended for pixels that don't move relative to the screen space.
Min Frame Count	Sets the number of frames combined and blended for fast moving pixels on the screen.

Last update: 2021-04-09

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