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
numTextures: The number of texture you want to use. You should have at least one texture and PxrMultiTexture supports up to 10 textures.
textureOrder: The number of textures you want to use.
angle: Rotation angle around origin
globalScale: Scale while preserving the aspect ratio defined by scaleS and scaleT
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
primvarS: Name of custom 1D S or 2D ST primvar
primvarT: Name of custom 1D T primvar