Houdini 18.0 Nodes VOP nodes

Fur Procedural VOP node

fur

The Mantra Fur Procedural creates a set of curves to represent hairs growing out from a surface polygon. CVEX shaders can be applied to manipulate attributes and the shape of the generated curves.

The number of generated curves is a result of the density multiplied by the area of the skin polygons. The area of the skin polygons is taken from the optional "area" attribute or calculated from the vertex positions described by the optional "rest" attribute or point positions.

The optional second input provides guide curves. The shape of the guide curves are interpolated to determine the shape of the generated curves (before CVEX shaders are applied) ignoring the "Length" and "Segments", on the Mantra Fur Procedural. Specify a Float3 primitive attribute called "guideorigin" on the guide curve geometry to use location-based interpolation. When the "guideorigin" attribute is present, Guide Radius will indicate the size of the area influenced by each guide curve.

The optional third input provides clump curves. The "clumporigin" and "clumpradius" attributes on the clump curves are used to map each generated curve to a clump.

The optional fourth input provides curves for parting lines.

Parameters

Skin - path to an object containing skin geometry Guides - path to an object containing guide hairs Clumps - path to an object containing clump center

Parting Lines - path to an object containing parting line

Expand Bounds - Amount to increase the bounding box of each

Fur

Group - primitives in the skin geometry from which to

Primitive Type - type of geometry to create Segments - number of segments in each generated curve

Length - length of the generated curves Seed - seed value for the random number generator Density - The number of generated curves is a result of

Display Ratio - Specifies a fraction of the curves to display. Guide Radius - Maximum distance a hair can be from a guide

Clump Radius - Maximum distance a hair can be from a clump

Use Closest Clump - Associates each hair with its closest clump Remove Unclumped Hairs - Remove all hairs not associated with a

Remove Unguided Hairs - Remove all hairs not influenced by a

Parting Radius - Maximum distance a hair can be from a parting

Attributes

Skin

Shader - The "Skin Shader" parameter specifies a

New Class - class for transferred attributes Transfer Attributes - Specifies a list of attributes from the

Set Hair ID - Creates a "hairid" attribute containing a

Guide

Shader - The "Guide Shader" parameter specifies a

New Class - class for transferred attributes Transfer Attributes - Specifies a list of attributes from the

VOP nodes