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This page provides information about V-Ray Fur in V-Ray for SketchUp.

Overview


V-Ray Fur is a very simple procedural fur plugin. The fur is generated only during render time and is not actually present in the scene, thus making the viewport faster. V-Ray Fur is more commonly used for simulating grass cover or textile fibers.

 

Creating V-Ray Fur


The V-Ray Fur button is inactive until a group or component object (sometimes referred to as closed geometry) in the scene is selected. The V-Ray Fur tool does not support nested groups or components and will stay grayed out if a group or component contains other nested groups or components.

When you select a group or component in the scene the V-Ray Fur button will become active.

Alternatively, you can create Fur from the Extensions menu > V-Ray > V-Ray objects > Apply Fur to Selection or from the Asset Editor > Geometry > Fur and use the Apply to Selection context option.

After creating a V-Ray Fur object, a bounding box with a V-Ray Fur icon will appear in the viewport around the selected group or component. The bounding box and icon represent the newly applied V-Ray Fur object properties.

The Fur object can be copied between groups or components by placing then inside a new group or component. The object will then receive all associated object properties.

By applying a material to the group or component, the fur object will absorb the applied material and use that applied material and UV Mapping for the Fur.
Note that V-Ray Fur will ignore back-face materials.

 

Parameters


VRay Fur – Enables or disables the VRay Fur. 

Distribution – Specifies how the density of strands is determined over the source object:

Per Face – Every face will generate the specified number of fur strands. Specifies the number of fur strands per face of the source object. 
Per Area – The number of strands for a given face is based on the size of that face. Smaller faces have fewer strands, larger faces have more strands. Every face has at least one strand.

Count (Area) – The number of strands for a given face is based on the size of that face. Smaller faces have fewer strands, larger faces have more strands. Every face has at least one strand. 

Density Map – The map is a multiplier for the strand density. Black portions of the map correspond to zero density (effectively no fur is generated in these areas). White represents the normal strand density, as specified by the Distribution parameter.

Length 1 – Specifies the length of the fur strands.

Thickness 1 – Specifies the thickness of the fur strands. It measures the strand radius.

Taper – Adds a taper to the individual strands of fur. Increasing this value will make each strand thinner at its upper end and wider at its base.

Gravity – Controls the force that pulls fur strands down along the Z-direction.

Bend – Controls the elasticity of the fur strands. When set to 0.0, the all strands are stiff and straight lines. Greater values cause the strands to bend (e.g. under the influence of the Gravity parameter).

Global Scale – Globally controls the scale of the fur in the scene.

Knots – Controls the number of connected straight segments the fur strands are rendered in. 

 

 

Variance


The Direction, Length, Thickness and Gravity parameters in this rollout add variation to their corresponding parameters from the Parameters rollout. Values range from 0.0 (no variation) to 1.0.

Bend Direction Map – Specifies a bend direction of the fur strands. This is the direction the fur strands are curved to (the amount of curvature is also controlled by the Bend parameter). The red component of the texture is offset along the U texture direction, the green component is the offset along the V texture direction, and the blue component is the offset along the surface normal.

Initial Direction Map – Specifies the initial direction of the fur strands. The red component is offset along the U texture direction, the green component is the offset along the V texture direction, and the blue component is the offset along the surface normal.

 

Curl


Curl – When enabled, adds curls to the fur.

Curl Radius 1 – Specifies the radius of an individual curl.

Curl Radius Variation – Allows you to add variation to the curl radius of the fur strands. 

Number of curls – Specifies the number of curls on a strand.

Curl Map – This map is a multiplier for the strand Curl. Black portions of the map correspond to no curl, and white represents the set curl, as specified by the Distribution parameters. 

 

 

Level of Detail


Level of detail – When enabled, V-Ray will generate less fur geometry for parts of the scene that are far away from the camera. This is done by decreasing the density of the fur strands and increasing their thickness. The level of detail function helps for two things. One, it conserves memory by decreasing the detail where it is too far to be visible, and two, it helps to reduce animation flickering of very fine fur strands when they are far from the camera.

Start distance 1 – Specifies the distance from the camera at which V-Ray will start implementing the Level of detail adjustment. Up to this distance the fur will be generated as specified by the user. After that V-Ray will decrease the density and increase the thickness of the strand by a factor of two for every n units of space specified by the Rate parameter.

Rate 1 – The rate at which the the Level of detail adjustment is applied. Starting from the distance specified in the Start distance parameter, V-Ray decreases the density and increase the thickness of the strands by a factor of two for every n units of space specified by the Rate parameter.

 

 

Material


Material toggle – When disabled, the V-Ray Fur uses the front-face material of the base mesh for shading. When enabled, it allows you to assign a different material.

Material selector – Specifies a scene material that is applied to the fur geometry. If a texture is used in this material, the texture placement will be based on the base mesh UVs/ placement.

The input slot () of the Material has a context menu available, if a material is slotted. Note that materials can also be drag-and-dropped into the slot. When you right-click on it, you can CopyCut or Clear the selected material. If you left-click on it, the Asset Editor jumps to the slotted material.

V-Ray Fur produces flat strands if Hair material is applied to it.

 


Options


Gravity Direction – Manually specifies the gravity vector.

 


Footnotes


  1. – Calculated in the default SketchUp unit - inches.