public static extern double IGFindMinimalDist(IPObjectStruct *PObj, IPPolygonStruct **MinPl, IrtPtType *MinPt, int *MinPlIsPolyline, IrtPtType *LinePos, IrtVecType *LineDir, double *HitDepth);
public static extern CagdCrvStruct *IPCurvesToCubicBzrCrvs(CagdCrvStruct *Crvs, IPPolygonStruct **CtlPolys, int DrawCurve, int DrawCtlPoly, double MaxArcLen);