Interior - Preview (High Diffuse Depth): Uses Irradiance Cache + Light Mapping. A fast preview with reduced Diffuse Depth. Interior - Preview: Uses Irradiance Cache + Radiosity Maps. Custom: As soon as you modify a GI setting, this option will be activated. These settings can then be fine-tuned to optimize render quality or render time. These presets should only serve as a starting point. Skies emit light evenly from a large surface, which makes it easier for GI to calculate exterior scenes. 
Exterior spaces are basically set up under an open sky.
Interior spaces are therefore more difficult to calculate for GI.
Interior spaces are mostly illuminated by fewer, smaller light sources: light that falls through windows, and lamps that emit light within a limited radius. You should differentiate between two main types: It’s important to know how your Scene is set up. Since there are so many possible combinations of GI methods, this Preset option lets you save GI settings for specific types of Projects and Scenes. 
Presets are available for the optional Global Illumination effect, in the Detailed view of PhotoRendering Settings for the CineRender engine.
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