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This causes the shape of patches to be driven purely by the data points sampled from inactive curves (this must therefore be enabled - see Data Points Page). This choice often produces the best results if there is a dense set of inactive curves that have been faired to a high degree. Poor results will occur if this data is badly distributed or unfair (see Some patches have an irregular shape).

See Reference: Patch Smoothing Functions for further information about the different smoothing functions.