Project: HiCAD 3-D
3-D FFS > Process > Weights 
 
As for splines, weights are the homogenizing factors for freeform surfaces.
Increasing the weight of a point lying on the de Boor polygon causes an approximation of the B-spline and the de Boor polygon. B-spline surfaces with weights ≠ 1 automatically become NURB surfaces.
            
        
Left: Original surface, Middle: Weight changes at the points marked in red. Right: Modified surface
            
        
Process Surfaces (3-D FFS) • Overview of Functions (3-D FFS)
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