Subsurface Scattering

Presets override user-defined custom settings. When any preset other than Custom is active, modification of the parameters via API has no effect. The parameter value set via the last API call shall be used only when the Custom preset is active. When checking the current parameter value via API you'll get the corresponding setting stored in the active preset (default or custom one).

Radius

The subsurface scattering radius — distance in the screen space, within which colors will be sampled. It controls how much wrinkles, pores and cavities will be blurred and highlighted. The higher the value, the farther subsurface scattering reaches. Too high values result in the ghosting effect. By the minimum value of 0, no subsurface scattering is rendered.
Range of values: [0.0f, inf]. The default value is 1.0f.
Console access: render_sssss_radius

Radius = 1

Radius = 0.2

SSSSS Color

The subsurface scattering color used to simulate the subsurface component of skin lighting, i.e. the light that bounces inside of the subsurface tissue layers (epidermis and dermis) before exiting.For skin, subsurface color is reddish, due to blood circulating in skin tissues. To use this option, SSSSS effect should be enabled.
vec4(1.0f, 0.0f, 0.0f, 1.0f) - default value
Console access: render_sssss_color

Threshold Min

The threshold of SSSSS (Screen-Space Subsurface Scattering) for the material's Translucent parameter equal to 0 (minimum translucency). To use this option, the SSSSS effect should be enabled.
Range of values: [0.0f, inf]. The default value is 4.0f.
Console access: render_sssss_min_threshold

Threshold Max

The threshold of SSSSS (Screen-Space Subsurface Scattering) for the material's Translucent parameter equal to 1 (maximum translucency). To use this option, the SSSSS effect should be enabled.
Range of values: [0.0f, inf]. The default value is 10.0f.
Console access: render_sssss_max_threshold

Translucency Options#

Translucent Color	The color used for translucent objects globally. When light shines on one side of the object, the other side is partially illuminated with this color. vec4(1.0f, 1.0f, 1.0f, 1.0f) - default value (white) Console access: render_translucent_color

Customizable Settings#

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

SSS custom settings

Subsurface Scattering Settings

Diffuse

The value indicating if the SSSSS (Screen-Space Subsurface Scattering) calculation for diffuse lighting (directional lights) is enabled. If this option is not required, disable it to save performance. To use this option, the SSSSS effect should be enabled. Enabled by default.
Console access: render_sssss_diffuse

Ambient

The value indicating if the SSSSS (Screen-Space Subsurface Scattering) calculation for ambient lighting (environment) is enabled. If this option is not required, disable it to save performance. To use this option, the SSSSS effect should be enabled. Enabled by default.
Console access: render_sssss_ambient

Quality

The quality of the SSSSS (Screen-Space Subsurface Scattering) effect. One of the following values:

Low - low quality
Medium - medium quality (by default)
High - high quality
Ultra - ultra quality

Console access: render_sssss_quality

Quality = Low

Quality = Ultra

Resolution

The resolution of the SSSSS (Screen-Space Subsurface Scattering) effect. One of the following values:

Quarter - quarter resolution
Half - half resolution (by default)
Full - full resolution

Console access: render_sssss_resolution

Noise Ray

The intensity of the ray noise used for SSSSS (Screen-Space Subsurface Scattering) calculation to reduce banding artifacts of tracing. Higher values make banding less visible. To use this option, the SSSSS effect should be enabled.
Range of values: [0.0f, 1.0f]. The default value is 0.5f.
Console access: render_sssss_noise_ray

Noise Step

The intensity of the step noise used for SSSSS (Screen-Space Subsurface Scattering) calculation to reduce banding artifacts of tracing. Higher values make banding less visible. To use this option, the SSSSS effect should be enabled.
Range of values: [0.0f, 1.0f]. The default value is 0.5f.
Console access: render_sssss_noise_step

Interleaved Rendering Options#

Enabled	The value indicating if the interleaved rendering mode for SSSSS (Screen-Space Subsurface Scattering) is enabled. 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, which reduces ghosting and noise artifacts. Enabled by default. Console access: render_sssss_interleaved
Samples	The number of pixels to be skipped when rendering the SSSSS (Screen-Space Subsurface Scattering) effect with subsequent reconstruction of neighboring pixels using the data from previous frames. The following options are available: 1 x 2 (1.0 * width x 0.5 * height) — a half of all pixels is rendered, skipping each second line 2 x 2 (0.5 * width x 0.5 * height) — a quarter of all pixels is rendered, skipping each second line and row Option #1 is selected by default (see above). Console access: render_sssss_interleaved_samples
Color Clamping	The 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. One of the following values: Disabled Low (by default) Medium High High + Velocity Console access: render_sssss_interleaved_color_clamping

Temporal Filtering Options#

Fix Flicker	The value indicating if the taa fix flicker option is enabled. This option fixes flickering edges caused by TAA: it removes bright pixels by using the pixel brightness information from the previous frame. It is recommended to enable the option for bright thin ropes, wires and lines. The option is available only when TAA is enabled. Notice Enabling this option may increase performance costs. Enabled by default. Console access: render_taa_fix_flicker
Frames By Color	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Frames By Color. Enabled by default. Console access: render_sssss_taa_frames_by_color
Fix Blur	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Catmull Resampling. Enabled by default. Console access: render_sssss_taa_catmull_resampling
Antialiasing In Motion	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Antialiasing In Motion. Enabled by default. Console access: render_sssss_taa_antialiasing_in_motion
Preserve Details	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Preserve Details. Range of values: [0.0f, inf]. The default value is 0.5f. Console access: render_sssss_taa_preserve_details
Frame Count	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Frame Count. Range of values: [0.0f, inf]. The default value is 30.0f. Console access: render_sssss_taa_frame_count

Frames By Velocity

Enabled	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Frames By Velocity. Enabled by default. Console access: render_sssss_taa_frames_by_velocity
Threshold	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Frames Velocity Threshold. Range of values: [0.0f, inf]. The default value is 1.0f. Console access: render_sssss_taa_frames_velocity_threshold
Max Frame Count	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Max Frames By Velocity. Range of values: [0.0f, inf]. The default value is 60.0f. Console access: render_sssss_taa_max_frames_by_velocity
Min Frame Count	The value of TAA parameter for Screen-Space Subsurface Scattering that is similar to TAA Min Frames By Velocity. Range of values: [0.0f, inf]. The default value is 4.0f. Console access: render_sssss_taa_min_frames_by_velocity

Last update: 2021-12-13

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