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The VRayUVWRandomizer map allows applying random offset, rotation and scale to textures, assigned to a single object with different Face IDs or different objects. It can be used as a mapping source for VRayBitmap and VRayTriplanar textures only. 

UI Path: Texture > V-Ray > VRayUVWRandomizer

Texture – Specifies the texture to be randomized. Note that it works only with VRayBitmap and VRayTrilanar.

Random by Polygon Selection – Considers the face IDs (from unique polygon selections) of the object when feeding the data (color or texture) to the material.

Random by Object ID – Considers the Object IDs of the object when feeding the data (color or texture) to the material.

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

Random by Instance – Assigns random colors based on the InstanceID (works for Alembic for Alembic instances and VRayInstancer source objects).

Random by Node Name – Considers the node name when feeding the data to the material.

Stochastic Tiling – Changes the mapping based on the UV tile.

Random by Render ID – Assigns random colors based on RenderIDs.

Random by Object ID – Considers the Object IDs of the object when feeding the data (color or texture) to the material.

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

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

Seed – Changes the randomization pattern.

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The offset variance controls the position of the texture along the U or V axis. 

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

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

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

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

The rotation variance rotates the texture along the U or V axis. 

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

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..)

This rollout controls the variance in the scale parameter.

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

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

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

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

V Scale Unlocked – When enabled, the U and V axes can be scaled separately.

See the workflow example in the video on how to randomize textures with UVWRandomizer and the Multi Sub texture.