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The Corona Ambient Occlusion (Corona AO) is a shader that can be used to color the concave and convex areas of a surface. By default, when used as diffuse color, it will darken crevices and cavities of objects while also brightening flat and raised areas. The Corona AO shader can also be used to create advanced materials, such as rusted metal, worn wood, and scratched paint, or to provide artistic control over the overall scene appearance.

Occluded color – This is the color that is used for occluded areas of the geometry.

Level – This is the intensity (also considered as the visibility) of the occlusion.

Occluded texture – Using this option, the occlusion can be controlled by a texture map or shader.

Texture – Defines the texture map or shader that will be used for AO.
Mix mode – Controls the blending mode of the texture map or shader.
Mix strength – Controls the intensity of the texture map or shader that is being used.