"It reads the geometry like a lie detector," Sol said. "Wherever two surfaces get close—a wall meeting a floor, a rafter touching a beam, a rock pressing against a foundation—light struggles to reach. Real light bounces. It's lazy. It avoids tight corners. AO calculates that loneliness."
"See?" Sol said. "You didn't add anything. You just stopped pretending every surface is equally blessed by the sky." ambient occlusion for sketchup
You're looking for information on ambient occlusion for SketchUp! "It reads the geometry like a lie detector," Sol said