The magnitude of the blur effect applied to create ambient occlusion shadows.
- iOS 11.0+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 11.0+
- watchOS 4.0+
Ambient occlusion is an effect that improves material shading by calculating the amounts of ambient light that reach various parts of a surface, creating shadows on parts of a geometry where incoming light is obscured by other parts of the geometry. (You can provide pre-rendered ambient occlusion effects for a material using its
ambient property.) Screen-space ambient occlusion (SSAO) provides a real-time approximation of this effect for the entire scene viewed through the camera.
SSAO shadowing includes a blur effect to realistically soften differences in shadow between adjacent pixels, which depends on both the smoothness of scene geometry and this factor. Larger blur factors create a softer, more spread-out blur; smaller factors create coarser shadowing effects.