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View Ambient Occlusion

Ambient Occlusion (AO) is a shading method that is often used as a replacement to Global Illumination because it can be much faster to render and easier to control, at the expense of accuracy. Visually-speaking, ambient occlusion adds extra soft self-shadowing, very apparent in cracks and crevices, and gives the image more realism. A common technique is to render the scene in as normal and then render out a separate Ambient Occlusion pass.  Then, both image passes are loaded into a compositor, and the ambient occlusion pass is multiplied onto the original image, adjusting the strength to fit the needs of the shot.