Hi, I just want to know if these two warnings have a negative effect on the solution and how can I do to avoid them. Warning 1: WARNING: check hole cutting: there were 1 potential problem points found in the hole cutting These points may cause failure of the algorithm. This warning may be generated if there is a portion of physical boundary that extends outside the actual domain in which case the algorithm should work Check the log file ogen.log for further info. INFO: Any suspicious discretization points that are too close to hole points will be plotted as `orphan points' (large squares). These points should probably be interpolation points. *** WARNING *** improveQuality: creating the vertex array for a rectangular grid Warning 2: Ogen::optimized overlap algorithm failed. will retry with full algorithm Have a nice day, joel ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ