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Most numeric V-Ray parameters come with a slider to make fine-tuning easier. Each slider is set to a default range of recommended or commonly used values.

If a value above that range is used the slider adapts by increasing its range accordingly (2x the input value) to maintain usability. If a value below the current slider range is used, the slider again adjusts its range by shrinking it to twice the amount of the input value.

Note that the slider range does not indicate the parameter's total minimum and maximum input values. The absolute minimum and maximum values of each parameter can be found by hovering over its spinbox.

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The unit-dependent parameters coming from Fur that are always measured in Revit standard units - feet include: Length, Thickness, Curl: Curl radius, Level of Distance: Start Distance, Rate and Distribution: per Area Count(Area) parameter which is measured in square feet.

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

Per Face

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VRay Fur – Enables or disables the VRay Fur.

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

Per FaceEvery face generates 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. For more information, see the example Count Area below.

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 Length – Specifies the length of the fur strands. See the Length example and the Maps example below for more information.

Thickness Thickness – Specifies the thickness of the fur strands. It measures the strand radius. See the Thickness example and the Maps example below for more information.

Taper – Adds a taper to the individual strands of fur. Increasing this value makes each strand thinner at its upper end and wider at its base. See the Taper example below for more information.

Gravity – Controls the force that pulls fur strands down along the Z-direction. See the Gravity example and the Maps example below for more information.

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

Global Scale – Globally controls the scale of the fur in the project. See the Global Scale example below for more information.

Knots Controls the number of connected straight segments the fur strands are rendered in. See the Knots example below for more information.

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Controls the number of connected straight segments the fur strands are rendered in. See the Knots example below for more information.

 

 

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The unit-dependent parameters coming from V-Ray Fur are always measured in Revit standard units - feet.

These include: Length, Thickness, Curl: Curl radius, Level of Distance: Start Distance, Rate and Distribution: per Area Count(Area) parameter which is measured in square feet.

 

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Example: Count Area

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Example: Length 

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Number of Curls = 0

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Number of Curls = 1

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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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Bend Map

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Density Map

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Gravity Map

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Length Map

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Thickness Map

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Curl Map 

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Bend Direction Map

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Initial Direction Map

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