# Page History

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Objects – Shows the geometry object(s) that is/are linked to this V-Ray Fur.

Distribution – Determines the density of strands over the source object:

Per Face
Per Area

Hairs per FaceSpecifies the number of fur strands per triangular face of the source object when Distribution is set to Per Face. Every triangle generates the specified number of fur strands.

Hairs per Unit AreaSpecifies the number of strands per squared scene unit when Distribution is set to Per Area. For example, if the the system units are in meters, this parameter specifies the desired number of strands per square meter; if the system units are centimeters, it specifies the number of strands per square centimeter and so on. Every triangle face has at least one strand.

LengthThe length of the fur strands. See the Length example below for more information.

ThicknessThe thickness of the strands. See the Thickness example below for more information.

GravityControls the force that pulls fur strands down along the Z-direction. See the Gravity example below for more information.

Gravity Vector – Specifies the gravity direction using vectors.

BendControls the elasticity of the fur strands. When it is 0, the strands are hard and are all straight lines. Greater values cause the strands to bend (e.g. under the influence of gravity). See the Bend example below for more information.

TaperAdds a taper to the individual strands of fur. Increasing this value will make the each strand thinner in its upper end and wider in its base. See the Taper example below for more information.

Fur ScaleGlobally increases the fur.

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#### Example: Length

Using this parameter you can specify the Length of the strands.

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#### Example: Thickness

Using this parameter you can specify the Thickness of the strands.

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These options add variation to their corresponding parameters. Values are from from (no variation) to 1.0.
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## Curl

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Curl – When enabled, adds curls to the fur.

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

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Using this parameter you can specify the radius of the individual curl.

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#### Example: Number of curls

Using this parameter you can specify the number of curls on a strand.

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Number of curls = 2

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Number of curls = 3

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Number of curls = 4

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Number of curls = 5

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Number of curls = 6

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Number of curls = 7

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Number of curls = 8

## Textures

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You can control some aspects of VRayFur with texture maps. These can be either bitmaps, or vertex color maps painted directly on the source object. Some of these texture maps (like Bend and Initial direction) represent vectors in texture space, where the X and Y directions are derived from the U and V directions of a texture UV set.

Bend Direction Texture – A RGB map which specifies a bend direction of the fur strands, in texture space (according to the specified Base map channel). This is the direction in which the fur strands curve to (the amount of curvature is also controlled by the Bend parameter). 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.

Initial Direction Texture – A RGB map which specifies the initial direction of the fur strands, in texture space (according to the specified Base map channel). 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.

Length/Thickness/Gravity/Bend texture – These maps are multipliers for the corresponding parameters, where black is a multiplier of 0.0, and white is a multiplier of 1.0.
Note: the alpha output of the textures is used, so you may need to enable the Alpha Is Luminance attribute for the textures.

Density Texture – This map is a multiplier for the strand density. Black portions of the map correspond to zero density (effectively no fur will be generated in these areas), and white represents the normal strand density, as specified by the distribution parameters. Note that the alpha output of the texture is used, so you may need to enable its Alpha Is Luminance option.

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### Example: Textures

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Thickness map (mono)

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Gravity map (mono)

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Bend map (mono)

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## Detail

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

Level of detail – When enabled, V-Ray generates less fur geometry for parts of the scene which 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.

LOD Start Distance – The distance from the camera at which V-Ray starts implementing the level of detail adjustment. Up to this distance the fur is generated as specified by the user, after that V-Ray is decreasing the density and increasing the thickness of the strand by a factor of two for every n units of space specified by the LOD Rate parameter.

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

Tessellation On – When enabled, V-Ray subdivides and smooths the fur strands before rendering. Strands closer to the camera are tessellated into finer segments so that they render smooth, while strands away from camera are simplified to reduce memory usage and speed up rendering.

Tessellation Edge Length – Specifies the desired edge length, in pixels, of each final segment of the fur strands when Tessellation On is enabled. Smaller values produce smoother strands but take more memory and are slower to render. Larger values are faster to render and take less RAM, but may cause the fur strands to appear jagged.

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