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This section contains settings related to screen-space ambient occlusion (SSAO).

Ambient Occlusion Settings

Enabled Toggles SSAO on and off.
Preset Quality preset of SSAO.
  • Simple Low — simple low quality preset
  • Simple Medium — simple medium quality preset
  • Simple High — simple high quality preset
  • Simple Ultra — simple ultra quality preset
  • Raytracing — raytracing calculations for SSAO are enabled
  • Raytracing + Denoise — raytracing calculations along with the noise reduction for SSAO are enabled
  • Custom — adjust the feature's quality manually
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).

Customizable Settings#

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

SSAO custom settings

Screen-Space Ambient Occlusion Settings
Intensity Brightness of shadows:
  • By the minimum value of 0, the ambient occlusion shadowing is the lightest.
  • By the maximum value of 1, the ambient occlusion shadowing is the darkest. It is recommended value.
Intensity Lighted Side Brightness of shadows on the object's lighted side. This option should be used to create smooth transition on objects junctions.
Intensity Reflection Intensity of SSAO on reflections. The option should be enabled if the SSR effect is used.
Cavity Enables or disables the cavity option for the SSAO effect. This option improves (sharpens) the look of junction contours at low resolutions, so it should be used for detail enhancement (small stones, bolts and so on).
Cavity Intensity Intensity of sharpening of contours for the cavity option.
Cavity Radius Size of junction contours area for the cavity option.
Color Clamping Intensity Intensity of TAA color clamping at zero pixel velocity:
  • lower values result in more accumulated frames combined, which reduces noise flickering, but increases ghosting effect (to reduce ghosting in this case you can use the Color Clamping Velocity parameter).
  • higher values up to 1 (default) reduce ghosting effect, but increase flickering
Color Clamping Velocity Sensitivity of TAA color clamping to pixel velocity change. This parameter is used to reduce ghosting effect for lower Color Clamping Intensity values: it automatically increases clamping intensity for higher velocities, and disables clamping for low velocity values.
Ray Tracing Enables or disables ray tracing for SSAO calculation. When enabled, SSAO provides more realistic shadows between the objects.
Ray-traced SSAO calculation available only when the SSRTGI technique is enabled (Rendering -> Features -> SSRTGI).

Ray Tracing Threshold Limits ray-traced SSAO in areas where SSRTGI cannot get information.
Ray-traced SSAO calculation available only when the SSRTGI technique is enabled (Rendering -> Features -> SSRTGI).

Quality Quality (number of the used samples) of the screen-space ambient occlusion:
  • Low — 4 samples
  • Medium — 8 samples
  • High — 16 samples
  • Ultra — 32 samples
Resolution Resolution used for the screen-space ambient occlusion:
  • Half — half resolution
  • Full — full resolution
Noise Toggles screen-space ambient occlusion noise on and off.
We recommend to use it with TAA enabled.
Radius Distance for each of the points in the world space, up to which they can cast shadows on their neighboring points:
  • By low values, each point can cast shadows only on the points in the close range.
  • By high values, each point casts shadows on points at more distant locations.
SSAO Threshold Limits SSAO in areas where information cannot be obtained. The higher the value, the less pronounced the effect is.

Ray Tracing Options#

Ray-Traced Global Illumination Settings

Ray-Traced Global Illumination Settings

These settings are available when the Ray Tracing option is enabled.

Ray Tracing Threshold Limits ray-traced SSAO in areas where SSRTGI cannot get information.

Denoise Options#

Denoise Enables or disables noise reduction for the ray-traced SSAO. This option reduces noise by using the blur effect.
Ray-traced SSAO calculation available only when the SSRTGI technique is enabled (Rendering -> Features -> SSRTGI).

Radius Radius of the area to be affected by noise reduction.
Quality Noise reduction quality level defining the number of samples used: higher values provide better reduction, but for a performance cost (choosing Medium is enough in most cases).
Intensity Noise reduction intensity: higher values provide a less noisy, but more blurred result.
Gaussian Sigma Sigma parameter of Gaussian blur used for noise reduction. This parameter controls the amount of blur applied.
Threshold Threshold value for color difference of neighboring pixels: blur is applied when the color difference is less than the threshold value.
Setting too high values results in blurring the whole image.
Last update: 2021-04-29
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