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Iso Line
 
 
 

Iso is short for isoparametric.

In NURBS modeling, a line of constant parameter value, similar to a contour line. You can use iso lines to display a NURBS surface. You can also create dependent NURBS curves based on a surface's U-dimension or V-dimension iso lines. See U and V Iso Curves.

Iso lines on a NURBS surface