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)