Hair Material


The Hair MaterialThe representation of the surface or volume properties of an object. has been designed to work with geometric files imported as hair and fur objects. This can include actual geometry in FBX.fbx (Filmbox) is a proprietary file format developed by Kaydara and owned by Autodesk since 2006. It is used to provide interoperability between digital content creation applications. As of Octane 3.07, a scene node will also be available as an FBX file, allowing for quick and easy transport of assets from industry standard DCC applications or obj format or hair/fur strands contained in AlembicAn open format used to bake animated scenes for easy transfer between digital content creation tools. files. FOr more information on working with hair and fur in OctaneRender®, please refer to the OctaneRender Standalone Edition documentation. The Hair Material parameters are focused on characteristics common with hair and fur strands (Figure 1).


Figure 1: The Hair material assigned to an imported Alembic file.



Figure 2: The Hair Material parameters.


Hair Material Parameters

Albedo - The hair base color.

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. - The hair specular or shininess color.

Melanin - The quantity of pigment for the hair base color.

Pheomelanin - The amount of redness in the hair strand.

Mode - Determines whether to use the Albedo or the Melanin/Pheomelanin parameters to determine the hair color.

Index of Refraction - This parameter controls the level of the Fresnel effect on the specular reflection.

Longitudinal Roughness - Controls the roughness along the hair strand.

Azimuthal Roughness - Controls the roughness along a hair strand's cross section.

Offset - Scale offset on the surface of the hair. A value of 0 demotes perfectly smooth cylindrical hair. Increasing this value shifts the specular highlight away from a perfectly reflective direction.

Randomness Frequency - Controls the frequency of randomness on the hair for a more believable effect.

Randomness Offset - Works much like a seed value and offsets the randomness effect.

Randomness Intensity - Controls the intensity of the randomness on each hair strand.

Random Albedo - Specifies the target random albedo on the hair. This parameter will only work with the Albedo mode enabled.

Opacity - Controls the transparency value of the hair using greyscale values.

Emission -Determines whether the hair material will function as an emission surface.

Material Layer - Adds a Material Layer above the base material. See the Material Layers topic in this manual for more details.