SSGI

This section contains settings related to screen-space global illumination (SSGI).

Global Illumination Settings

Screen-Space Global Illumination Settings

Enabled

Toggles SSGI on and off. It enables indirect illumination in the scene.

Intensity

Brightness of illumination:

By the minimum value of 0, the illumination is the darkest.
By the maximum value of 1, the illumination is the brightest.

Intensity = 0.2

Intensity = 1

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 SSGI calculation. When enabled, SSGI recreates light reflections from the object’s surface.

NoticeRay-traced SSGI calculation available only when the SSRTGI technique is enabled (Rendering -> Features -> SSRTGI).

Quality

Quality (number of the used samples) of the screen-space global illumination:

Low — 4 samples
Medium — 8 samples
High — 16 samples
Ultra — 32 samples

Quality = Low

Quality = Ultra

Resolution

Resolution used for the screen-space global illumination:

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

Resolution = Quarter

Resolution = Full

Resolution Color

Resolution of the color buffer used for screen-space global illumination.

Radius

Determines the size of the region surrounding a particular sampling point:

By low values, each point affects only the points in the close range.
By high values, each point affects farther positioned points.

Radius = 0.5

Radius = 1

Normal Threshold

Determines sensitivity of GI to normals. Normals affect ray intensity: smaller angle of incidence increases ray intensity.

By the minimum value of 0, normals are ignored.
By the maximum value of 1, normals are taken into account.

Normal Threshold = 0

Normal Threshold = 1

Ray Tracing Options#

Ray-Traced Global Illumination Settings

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

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

Denoise Options#

Denoise	Toggles noise reduction for the SSGI effect on and off.
Radius	Radius of the area to be affected by noise reduction.
Quality	Noise reduction quality level defining the number of samples used: Low — low quality Medium — medium quality High — high quality Ultra — ultra quality 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. Notice Setting too high values result in blurring the whole image.

Last update: 16.08.2019

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