The overall color of the surface. Depending on other parameters, this can have different effects.

When Metallic is 0.0, Base Color controls the color of diffuse reflections. Use Reflect Tint to also tint reflections.

When Metallic is 1.0, diffuse is faded and Base Color only controls the color and intensity of reflections.

Use Sheen Tint to tint the Sheen effect with the Base Color.

Values closer to 1 give the shader a more metallic appearance.

This is done by fading out the diffuse component and driving reflectivity by Base Color. This makes it easy to create the colored reflections typical of metallic materials.

Controls the reflectivity of surfaces facing the viewer. This replaces the Index of Refraction parameter found on other shaders to allow for more direct control over visual appearance.

When a surface is rotated away from the viewer, more and more light is reflected regardless of this parameter’s value. At 90 degrees away from the viewer, 100% of the light is reflected, as in the real world.

The effect of Reflect on a black object in a white environment. Note how reflections at the edges are not affected unless Reflect is exactly 0.0.

Tints reflections with the Base Color. This is not typical of non-metallic materials, but can be used for artistic purposes.

Controls how dull a surface appears. A value of 0.0 results in a smooth surface with perfectly sharp reflections. A value of 1.0 produces a completely dull surface. Under the hood, this simulates microscopic bumps which become more pronounced the higher the Roughness, causing reflected light to be scattered more.

The effect of Roughness on a material with Metallic set to 1.0:

The effect of Roughness on a material with Metallic set to 0.0:

Causes reflections to be stretched in the direction defined by Anisotropy Direction.

This simulates microscopic bumps with a directional bias, causing light to be scattered more in the defined direction. This is typical of brushed metals.

The effect of this parameter increases with Roughness. It has no effect at all when Roughness is 0.0.

Controls the direction of Anisotropy relative to the UV coordinates of the surface. At 0.0, reflections are stretched in the U direction. At 0.5, the direction is rotated by 90 degrees to the V direction. 1.0 equals 180 degrees. Since the effect is symmetrical this produces the same result as 0.0.

The direction of rotation also depends on the UV layout. When the UVs are layed out such that textures appear on the surface without mirroring, higher values rotate counter-clockwise.

The effect of this parameter diminishes with decreasing Roughness and Anisotropy.

This parameter has it’s own Filter Type parameter which appears when Use Texture is enabled. This defaults to Point (No Filter), which usually works best. When you change this to an actual filter like Gaussian, artifacts may appear around the transition between areas with different direction values.

Gives the appearance of subsurface scattering. This is a fast approximation and doesn’t perform actual SSS.

Produces extra reflections at grazing angles, which can be useful to match certain cloths and some other materials.

Tints reflections produces by Sheen with the Base Color. This can help with matching certain cloth materials.

Controls the intensity of coat reflections. The coat can have a different Roughness value than the base layer, see Coat Roughness.

Controls the roughness of Coat reflections.

The color of light emitted from the surface.

Controls whether emission should illuminate other objects.

Specifies a label for the diffuse component. This can be used to export contributions from this component to a separate image plane.

Specifies a label for the base reflection component. This can be used to export contributions from this component to a separate image plane.

Specifies a label for the coat reflection component. This can be used to export contributions from this component to a separate image plane.