https://c4dplugin.com/product-sp
SplinePatch generates surfaces from three or four splines. It is designed as an object generator and works fully parametric.
The MultiPatch welds several Spline Patches to one smooth surface and rounds outer edges with an editable profile. The new SplineCage object creates and manages all connections between the splines of a cage and generates all desired surfaces with just one mouse click. 
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