13.4.2.2 Blending attributes

Blending section

Weight

Sets the overall opacity of the material layer. A value of 0 shows the base material, a value of 1 the layered material.

Mode

Defines the way how the blending is calculated

Constant

This mode determines the opacity of the layer directly, without any dependency on the incident angle.

Curve: The weight is multiplied by a Fresnel-like customizable curve. This method is intended to provide artistic control.

At 0 Degrees: Sets the weight for angle of incidence normal to the surface.
At 90 Degrees: Sets the weight for angle of incidence at 90 degrees to surface normal.
Exponent: Describes the transition between the values set at the attributes At 0 Degree and At 90 degree. It is the exponent for Schlick's approximation.

Fresnel

The weight is multiplied by a Fresnel curve, calculated using the provided index of refraction. This is typically the physically-correct approach to rendering varnishes, clear coats, and Fresnel reflections.

Refraction Index:
The refraction taken into account by the Fresnel term to define the specular reflection. The attribute is defined using a float to describe the Fresnel Index.

Fresnel (Advanced): Same behaviour as Fresnel.

Refraction Index:
The refraction taken into account by the Fresnel term to define the specular reflection. The attribute is defined using a color. So for each channel R,G,B a different values for the Fresnel Index are possible.

Refraction Index

Defines the refraction taken into account by the Fresnel term to define the specular reflection.