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SSR

The section contains settings that control screen-space reflections (SSR).

Screen-space reflections settings

Screen-Space Reflections Settings

Enabled Toggles the SSR effect on and off.
Importance Sampling Toggles the importance sampling mode for the SSR effect on and off. Importance sampling provides more accurate but slower calculation of SSR roughness, reduces artifacts around objects that can appear at low resolution (lower than full).
Increased Accuracy Toggles increased accuracy of ray tracing for the SSR effect on and off. This option reduces visual artifacts around objects, which can appear at low resolution (lower than full), by increasing accuracy of the last step.
Fast Tracing Toggles fast tracing for the SSR effect on and off. This mode makes it possible to obtain distant reflections using low number of steps while keeping performance high. However, tiny objects may not be reflected. Disabling this mode improves quality but significantly drops performance.
Resolution Resolution of the SSR:
  • Quarter — 1/4 resolution (by default)
  • Half — 1/2 resolution
  • Full — full resolution
Notice
Can be controlled by render_ssr_resolution console command.
Resolution Depth Resolution of the depth buffer used for SSR calculation. This option affects detailing of reflections of tiny objects.
  • Quarter — 1/4 resolution
  • Half — 1/2 resolution
  • Full — full resolution
Notice
To gain performance, this option can be set to lower values while enabling Increased accuracy.
Resolution Color Resolution of the color buffer used for SSR calculation. This option significantly affects performance.
  • Quarter — 1/4 resolution (by default)
  • Half — 1/2 resolution
  • Full — full resolution
Num Rays Number of rays of SSR traced per pixel that are used to calculate rough refrections. Using more rays provides more precise SSR roughness calculation, however, it is more expensive.
Notice
The option is available when importance sampling is enabled.
Num Steps Number of steps of SSR per ray that are used for trace calculation. Defines accuracy of reflections and causes a reasonable performance impact. The higher the value, the more accurate obstacles between objects are accounted.
Step Size Size of the trace step used for SSR calculation. The higher the value, the longer the trace. However, tiny objects may be missed. The lower the value, the more detailed reflections of the tiny objects will be.
Noise Step Intensity of the step noise used for SSR calculation. This parameter is used to reduce the banding effect of tracing by using the noise.
Noise Ray Intensity of the ray noise used for SSR calculation. This parameter is used to reduce the banding effect on rough reflections by using the noise.
Notice
The option is available when importance sampling is enabled.
Roughness Quality Quality of screen space reflections roughness:
  • Low — low quality
  • Medium — medium quality
  • High — high quality
  • Ultra — ultra quality
Notice
Can be controlled by render_ssr_roughness_quality console command.
Visibility Roughness Min Minimum roughness value of the reflective material, at which the SSR effect is fully visible. Using this option together with Visibility Roughness Max allows reducing noise of reflections on rough materials.
Visibility Roughness Max Maximum roughness value of the reflective material, at which the SSR effect is not rendered. Using this option together with Visibility Roughness Min allows reducing noise of reflections on rough materials.
Threshold Limits imitation of reflections in areas where SSR cannot get information. The higher the value, the less this effect is.
Threshold Occlusion Limits imitation of environment cubemap occlusion in areas where SSR cannot get information. The higher the value, the less this effect is. This parameter is mainly used for indoor environment to correct false reflections on occluded areas (false reflections are replaced with black color). For outdoor environment higher values of this parameter are recommended.
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.

Denoise Options#

Denoise Toggles noise reduction for the SSR 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: 2019-11-28