public CompareResult Compare(IModelDoc2 refDocument, IModelDoc2 modDocument)
        {
            string refFileName      = refDocument.GetPathName();
            string modFileName      = modDocument.GetPathName();
            int    volumeDiffStatus = 0;
            int    faceDiffStatus   = 0;

            SwApp.GetSwCompareGeometry().CompareGeometry3(refFileName, "", modFileName, "",
                                                          (int)gtGdfOperationOption_e.gtGdfFaceAndVolumeCompare, (int)gtResultOptions_e.gtResultNoUI, "",
                                                          false, false, ref volumeDiffStatus, ref faceDiffStatus);

            // Console.WriteLine(" +++++ GeomDiff " + volumeDiffStatus + " --- " + faceDiffStatus + "   " + refFileName + "  " + modFileName);

            return(new CompareResult());
        }