Freeform surfaces used in several domains such as aeronautics, automotive, medical etc. CAD models are an interface between designer and CAD software. These models can be obtained using Forward Engineering or Reverse Engineering approach (Raja and Fernandes 2008). The former one consists in using CAD functionalities to design object surfaces with low geometric complexity. The later one is used if objects CAD models are unavailable or surfaces geometries are of high complexity. Reverse Engineering approach is widely used in mechanical engineering, electrical, medical, etc. Its main objective is the analysis of a physical object in order to reproduce or to improve the CAD model (Ali 2015).
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