User Manual

Table Of Contents
Controls Tab
The Controls tab contains parameters for adjusting the main color, highlight, and lighting
properties of the Cook Torrance shader node.
Diuse
Diffuse describes the base surface characteristics without any additional effects like reflections
or specular highlights. Besides defining the base color of an object, the diffuse color also
defines the transparency of the object. The Alpha in a diffuse texture map can be used to make
portions of the surface transparent.
Diffuse Color
A material’s Diffuse Color describes the base color presented by the material when it is lit
indirectly or by ambient light. If a diffuse texture map is provided, then the color value provided
here is multiplied by the color values in the texture.
Alpha
This slider sets the material’s Alpha channel value. This affects diffuse and specular colors
equally, and affects the Alpha value of the material in the rendered output. If a diffuse texture
map is provided, then the Alpha value set here is multiplied by the Alpha values in the
texture map.
Opacity
Reducing the material’s Opacity decreases the color and Alpha values of the specular and
diffuse colors equally, making the material transparent.
Specular
The parameters in the Specular section describe the look of the specular highlight of the
surface. These values are evaluated in a different way for each illumination model.
Specular Color
Specular Color determines the color of light that reflects from a shiny surface. The more
specular a material is, the glossier it appears. Surfaces like plastics and glass tend to have white
specular highlights, whereas metallic surfaces like gold have specular highlights that inherit
their color from the material color. If a specular texture map is provided, then the value provided
here is multiplied by the color values from the texture.
Specular Intensity
Specular Intensity controls how strong the specular highlight is. If the specular intensity texture
is provided, then this value is multiplied by the Alpha value of the texture.
Roughness
The Roughness of the specular highlight describes diffusion of the specular highlight over the
surface. The greater the value, the wider the falloff, and the more brushed and metallic the
surface appears. If the roughness texture map is provided, then this value is multiplied by the
Alpha value from the texture.
Do Fresnel
Selecting this checkbox adds Fresnel calculations to the materials illumination model. This
provides more realistic-looking metal surfaces by taking into account the refractiveness of
the material.
Chapter –82 3D Material Nodes 1776