The tyUVWRandomize modifier can be used to randomize the position, orientation and scale of UVW elements.
Per object: the faces of each object the modifier is applied to will be grouped together, and randomized as a single, combined element.
Per mesh element: the faces of each mesh element of each object the modifier is applied to will be grouped together, and randomized individually.
Per UVW element: the faces of each UVW element of each object the modifier is applied to will be grouped together, and randomized individually.
Use face selection: when enabled, only UVW faces corresponding to selected faces on input meshes will be affected.
Enable material ID filter: when enabled, only UVW faces corresponding to mesh faces with matching material IDs will be affected.
Display UVW/system units: controls how position units will be displayed in the modifier.
U min/U max/V min/V max: controls the minimum and maximum random offset along the U/V axis in UV space (these spinners are visible when not constraining the U/V parameters to a single value with the “>>” buttons).
U/V: controls the maximum range of random offset (from -U to U and -V to V) along the U/V axis in UV space (these spinners are visible when the U/V parameters are constrained to a single value with the “>>” buttons).
Step: when set to a value greater than zero, random U/V offsets will be constrained to multiples of this value.
To randomize the position of elements across multiple UDIMs, set the step value to 1.0 and the U/V values to something greater than 1.
Angle min/Angle max: controls the minimum and maximum random angle to rotate elements around the W axis in UVW space (these spinners are visible when not constraining the angle parameter to a single value with the “>>” button).
Angle: controls the maximum range of random angle (from -angle to angle) to rotate elements around the W axis in UVW space (this spinner is visible when the angle parameter is constrained to a single value with the “>>” button).
Step: when set to a value greater than zero, random angles will be constrained to multiples of this value.
Seed: the random seed for the angle parameter.
% min/% max: controls the minimum and maximum random multiplier to apply to element scale in UV space (these spinners are visible when not constraining the scale parameter to a single value with the “>>” button).
%: controls the maximum range of random multiplier (from 100% to %) to apply to element scale in UV space (this spinner spinners is visible when constraining the scale parameter to a single value with the “>>” button).
Seed: the random seed for the scale parameter.