Sketchup — Ambient Occlusion

For a SketchUp user, the distinction is vital:

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In traditional rendering terminology, Ambient Occlusion is a shading method used to approximate the way light radiates in real life, especially when considering indirect illumination (Global Illumination). sketchup ambient occlusion

In the real world, these areas naturally trap less light; AO mimics this effect to prevent models from looking "flat" or "washed out". For a SketchUp user, the distinction is vital: