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The required input data are the mathematical formulae of the coordinates X(u,v), Y(u,v) and Z(u,v), where 'u' and 'v' are the parameters of the surface, and its value belongs to the intervals set in 'u in' and 'v in' respectively. The surface is created by approximation and is a NURBS (Non-Uniform Rational B-Spline), which is created with 'Number of points U' x 'Number of points V' points. In GiD these kinds of surfaces are cubic (order 3).
The valid mathematical funcions are all Tcl functions:
+ - * / %
abs cosh log sqrt acos double log10 srand asin exp pow tan atan floor rand tanh atan2 fmod round ceil hypot sin cos int sinh