Screen Space Global Illumination (SSGI) - Community Shaders

OVERVIEW

This Community Shaders addon simulates ambient occlusion (AO) and indirect lighting (IL) using screen space information. Supports SE and AE.

FEATURES

AMBIENT OCCLUSION

Produces the darkening effect around objects that occlude ambient light.

• []In exteriors, it applies only to ambient light sources and not to direct lights like sun light.[/]

  []In interiors, it applies to everything to compensate for the lack of shadowed interior lights.[/]

  INDIRECT LIGHTING

  Simulates lights bouncing on diffuse surfaces, and emitted from emissive objects.

  Includes a very rough specular IL that approximates the indirect lighting on specular material from True PBR or Dynamic Cubemaps.

  SCREEN SPACE

  The feature only utilizes what is available on your screen, which means that AO/IL may pop in and out depending on your view, or be occluded by object closer to the camera.

  FREQUENTLY ASKED QUESTIONS

  I see noises!

  • []For performance reasons, the default settings has been set to handle most cases with little noise and least cost, but there are still tricky scenarios, especially when the object is moving fastly, or when a bright light source covers a tiny fraction of the screen. Here is what you can do:

    []Turn up slices and steps, if your frame rate can afford it.[/]

    []Use full-res and TAA/DLAA/FSRAA. TAA adds an additional layer of noise filtering when full-res.[/]

    []In advanced settings, turn up accumulation frames. This will introduce more ghosting.[/]

    [](IL only) In advanced settings, turn up blur radius. This will make IL more blurry.[/]

    []Turn down the effect radius, so the samples have less variance.[/]

  [/]

  How is the performance?

  [*]It will be a tad heavier than your usual CS features. Such is inevitable of any IL algorithm.