Preset (CineRender Global Illumination)
Presets are available for the optional Global Illumination effect, in the Detailed view of PhotoRendering Settings for the CineRender engine.
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Interior spaces are mostly illuminated by fewer, smaller light sources: light that falls through windows, and lamps that emit light within a limited radius. Interior spaces are therefore more difficult to calculate for GI.
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Exterior spaces are basically set up under an open sky. Skies emit light evenly from a large surface, which makes it easier for GI to calculate exterior scenes.
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Preview: These have reduced values, which can be calculated quickly and are well-suited for test renderings.
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High: Designed for higher quality renderings. However, it may be necessary to increase or decrease individual values to achieve the desired render speed/quality.
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Custom: As soon as you modify a GI setting, this option will be activated.
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Interior - Preview: Uses Irradiance Cache + Radiosity Maps. A fast preview with reduced Diffuse Depth.
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Interior - High: Uses Irradiance Cache + Irradiance Cache.
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Exterior - Preview: Uses Irradiance Cache + Radiosity Maps. A fast preview with reduced Diffuse Depth.
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Exterior - Physical Sky: Uses Irradiance Cache + QMC.
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Exterior - HDR Image: Uses Irradiance Cache + QMC.
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Preview: These have reduced values, which can be calculated quickly and are well-suited for test renderings.
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The difference between Physical Sky and HDR Image: Force Per-Pixel is enabled for the latter. An HDR image assigned to a Sky object is evaluated precisely for rendering, which will more precisely render multiple shadows - if they are present in the HDR image (note that the Diffuse Depth value may have to be increased).
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Object Visualization - High: Uses Irradiance Cache + Irradiance Cache.
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Progressive - No Prepass: Uses QMC + QMC.
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