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This page provides information about the UVW Gen Randomizer texture in V-Ray for Blender.


Overview

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The V-Ray UVW

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Randomizer allows applying random offset, rotation, and scale to textures. To use it, connect the UVW

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Randomizer to the 

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Uvw attribute of a texture node.

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Properties

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Random By Face – Considers the face IDs of the object when feeding the data (color or texture) to the material.

Random By Render Id – Assigns random colors based on RenderIDs.

Random By Particle – Assigns random colors based on ParticleID.

Random By Instance – Assigns random colors based on InstanceID (works for Alembic instances).

Random By Object Objects Id – Considers the Object IDs of the object when feeding the data (color or texture) to the material.

Random By Node Handle – Each node in Houdini is assigned a unique number (a handle) when it is created. This option generates erates the color index based on that node ID. It is useful because the node handle survives through scene editing - e.g., if you add/remove other objects or rename them, you still get the same colors.

Random By Node Name – Generates erates a color index based on the name of the node that the texture is applied to. This allows the color to remain consistent if the object is merged into another scene, or X-Ref'd, etc.

Random By Mesh Element – Assigns random colors based on the element (e.g., teapot lid, etc.) IDs of the object.

Random By Uv Tile Stochastic Tiling – Changes the mapping based on the UV tile.


Tile Blend – Edge blending between adjacent tiles when Stochastic Tiling is used.

Seed – Changes the randomization pattern.

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Offset Variance

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The Variance controls the position of the map along the U or V axis.


Variance U Range Min/ Max – The min and max range in which the offset of the U axis is applied.

Variance U Steps – Specifies the number of steps in which the variance interval is achieved.

Variance V Range Min/Max –The min and max range in which the offset of the V axis is applied. 

Variance V Steps – Specifies the number of steps in which the variance interval is achieved.

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Rotation Variance

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Rotation Range Min/Max Variance rotation min/max –  The min and max range in which the rotation parameters are applied.

Variance rotation Rotation steps – Specifies the number of steps in which the variance interval is achieved. For example, if UV rotation is set from 0 to 360 with a Step of 5, the texture is rotated at an angle that is a multiple of 72 degrees (e.g. 72, 144, 216..)

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Scale Variance

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U Scale Range Min/Max U scale min/max – The min and max range in which the scale parameters are applied to the U axis.

Variance U scale stepsScale Steps – Specifies the number of steps in which the variance interval is achieved on the U axis.

Variance V scale min/maxScale Range Min/Max – The min and max range in which the scale parameters are applied to the V axis.

Variance V scale steps Scale Range Steps – Specifies the number of steps in which the variance interval is achieved on the U axis.

Variance V scale unlocked Scale Unlocked – When enabled, the U and V axes can be scaled separately.Tile Blend – Edge blending between adjacent tiles when Random By Uv Tile is used.

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Mapping

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Wrap U/V – Controls how the map is wrapped.

None – It is rendered as is.
Tile – Tiles the bitmap.
Mirror Tile – Tiles the bitmap in a mirror pattern.

Crop U/V – When enabled, crops the map on the respective axis.

Wrap Mode – Specifies how to wrap the map:

On 0.5 Boundaryboundary
On Integer Boundaryboundary

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