Abstract: In view of the limitations of arbitrary degree cutting, the deficiency of model inside interaction and the low precision of cutting of medical images, a new method of the second extraction of 3D virtual slices is proposed, based on interactive location. On the Visual C++ platform, with the highly flexible and portable VTK, this method was used to cut again the tooth model to compensate for the problem of weak interaction and low precision. The new method has good interaction and realtime. Meanwhile, this method can be used to cut again any arbitrary part of  the 3D model, so it has good application prospects in the medical field.

Key words: interactive location; arbitrary cutting; cutting again; visualization tool kit