An object that provides color values to determine the apparent smoothness of the surface.
- iOS 10.0+
- macOS 10.12+
- tvOS 10.0+
- watchOS 3.0+
This property measures only the total intensity of color values; texture contents are best defined in grayscale.
This property approximates the level of microscopic detail—for example tiny bumps and cracks—in a surface. By approximating these “microfacets” as a single term, this property helps produce lighting calculations that resemble the energy-conserving laws of real-world physics, resulting in more realistic variation between matte and shiny surfaces. Lower values (darker colors) cause the material to appear shiny, with well-defined specular highlights. Higher values (brighter colors) cause specular highlights to spread out and the diffuse color of the material to become more retroreflective.