# Enter start, stop and step values for the ranges of both coordinate variables in the selected orientation plane.
# Enter a mathematical expression in terms of the coordinate variables in the selected orientation plane for the definition of the parametric surface.
# Make sure to click the <b>OK </b> button of the dialog to complete the surface construction.
NOTES, SPECIAL CASES OR EXCEPTIONS: You can always edit and modify a parametric surface after you first create it in the surface generator. The property dialog of a parametric surface object is indeed the surface generator itself, where you can change the parameter values or the defining expression.