This page provides information on the Hair Properties in V-Ray for Houdini. 

 

Overview

The V-Ray Hair Properties can be added to a curve or points/particles. This makes the curve directly renderable, without intermediate conversion to polygons. Internally, the curve is converted to hair. It allows control over the hair tessellation. 

To add the Hair Properties, select the curve or points and press Hair Properties button residing in the V-Ray shelf. This will create a V-Ray tab to the object's properties menu. 

 

UI Paths:

||V-Ray shelf|| > Hair Properties (with the curve/points selected) > V-Ray > Hair

V-Ray menu > Object Properties > Hair

 

Hair

Width – Specifies the width of the strand. By default this value is in world units.

Tesselation – This option allows manual control over the number of subdivisions when intersecting the spline based hairs. 

Min. Pixel Width – Sets the minimum pixel width of each hair strand to help ensure samples are taken consistently between pixels. A value of 0 means no minimum width is applied, but increasing it helps make sure each strand is consistently rendered. This additional calculation increases render times, but smooths the hair width. 

Render as Smooth Curves –  When enabled, hair strands are represented as splines instead of line segments.

Width in Pixels – When enabled, the Width parameter is calculated in pixels. 

Generate W Coord – When enabled, V-Ray generates a W mapping coordinate that represents the position of the shaded point along the hair strand. This is useful for mapping a ramp texture, for example.