Material Layer Specular


The SpecularAmount of specular reflection, or the mirror-like reflection of light photons at the same angle. Used for transparent materials such as glass and water. material layer is used for shiny materials like plastics, or clear materials like glass (figure 1). Refer to the Specular MaterialThe representation of the surface or volume properties of an object. topics in this manual for more information.


Figure 1: A Material Layer Specular node added to the Material Layer pin on a Diffuse materialUsed for dull, non-reflecting materials or mesh emitters.


Material Layer Specular Attributes

Specular - The layer's coating color.

TransmissionA surface characteristic that determines if light may pass through a surface volume. - The layer's transmission color.

BRDF Model - The BRDF (Bidirectional Reflectance Distribution Function) determines the amount of light that a material reflects when light falls on it.

Roughness - The layer's roughness.

Affect Roughness - The percentage of roughness affecting subsequent layers' roughness.

Anisotropy - The layer's anisotropy. A value of -1 is horizontal, while 1 is vertical. A value of 0 is Isotropic.

Rotation - The rotation of the specular anisotropic reflection.

IOR - The specular reflection's or transmission's Index Of Refraction.

1/IOR Map - The Index of Refraction map. Each texel represents 1/IOR. When this is empty, OctaneRender® uses the IOR value. If this is not empty, then this parameter overrides the Index Of Refraction set by the IOR value.

Film Width - Sets the film coating's thickness.

Film IOR - Sets the film coating's Index Of Refraction.

Thin Layer - Makes the layer very thin so it reflects, or goes straight though the layer.

Bump - Simulates a relief by using a Greyscale texture interpreted as a Height map for the layer.

Normal - Distorts layer normals using an RGB image.

Dispersion Coefficient - This is the B parameter of the Cauchy dispersion model. Increasing this value increases the coloration amount and dispersion in the layer’s transmission and caustics.

Opacity - Controls the layer's opacity with a Greyscale texture.