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SSR

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

Screen-space reflections settings

Importance sampling Enables or disables the importance sampling mode for the SSR effect. Importance sampling provides more accurate but slower calculation of SSR roughness, reduces artifacts around objects that can appear at resolution lower than full.
Increased accuracy Enables or disables increased accuracy for the SSR effect. This option reduces visual artifacts around objects, which can appear at resolution lower than full, by increasing accuracy of the last step.
Denoise Enables or disables noise reduction for the SSR effect.
Fast tracing Enables or disables fast tracing for the SSR effect. 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:
  • Quad — 1/4 resolution
  • 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.
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 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 will be reflections of the tiny objects.
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, starting from which the SSR effect begins to fade out.
Visibility roughness max Maximum roughness value, starting from which the SSR effect is not rendered.
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.
Last update: 2017-10-20