Encapsulates 2D parameterization for pattern generators. Allows transformations and selection of arbitrary variables bound to primitives. Uses a simple struct to represent bundled dataflow of outputs. @parameters

angle: Rotation angle around origin

scaleS: Frequency of feature in S

scaleT: Frequency of feature in T

offsetS: Offset from origin in S

offsetT: Offset from origin in T

invertS: Flip along S

invertT: Flip along T

primvarS: Name of custom 1D S or 2D ST primvar

primvarT: Name of custom 1D T primvar

VOP nodes