The index of refraction for the medium surrounding a material.
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
This value corresponds to the
n1 parameter in Schlick’s equation for approximating Fresnel reflection effects. Typically, one assumes a the medium surrounding a material is air or empty space, so the default value of
1.0 suffices for most uses of this semantic.
Working with Shading Properties
The inherent color of the material, to be used as a modulator during shading.
The color emitted as radiance from a material’s surface.
The intensity of specular highlights on the material’s surface.
The variation in the surface normal vectors in a material, relative to model coordinate space.
The attenuation of ambient light due to local geometry variations on a surface.