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

coordsys: Name of coordinate system transform (e.g. place3dTexture node in Maya). Standard coordinate systems : 'object', 'world', 'screen', 'NDC'.

traceSet: A trace set for occlusion testing

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

invertT: Flip along T.

VOP nodes