Global Illumination (CineRender)
This effect is available in the Detailed view of PhotoRendering Settings for the CineRender engine.
Global Illumination (GI) is a sophisticated method for achieving realistic lighting effects in your model. The algorithm simulates the effects of not just direct light sources, but indirect light effects - that is, inter-reflections caused by light rays bouncing off surfaces.
With CineRender, you can achieve very high-quality renderings using Global Illumination. However, it can greatly increase render time.
Preset (CineRender Global Illumination)
Primary and Secondary Method (CineRender Global Illumination)
Sampling (CineRender Global Illumination)
Irradiance Cache (Legacy) (CineRender Global Illumination)