unituv expression function

Converts real UV to unit UV.

See also: realuv

The unit value is defined in the [0,1] interval. The real value is defined in the valid interval of the primitive’s domain if the primitive is a spline type. If the primitive is a polygon or a mesh, the size of its domain is given by the number of vertices, or rows or columns respectively. If the primitive is a polygon or a curve, D_U and D_V are irrelevant.