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Set Tolerances and Compare Geometry Example (C#)

his example shows how to set the tolerances and then compare the volume and geometry of two versions of the same part using the SOLIDWORKS Utilities API.

' Preconditions:
' 1. Add the SOLIDWORKS Utilities as an add-in
'    (in SOLIDWORKS, click Tools > Add-Ins > SOLIDWORKS Utilities).
' 2. Add the SOLIDWORKS Utilities interop assembly as a reference
'    (right-click the project in Project Explorer, click Add Reference > 
'    browse to install_dir\api\redist\CLR2 > SolidWorks.Interop.gtswutilities.dll).
' 3. Verify that the specified files exist.
' 4. Verify that C:\test\ exists.
' Postconditions:
' 1. Creates a geometry comparison report, C:\test\Report\gtReportIndex.htm.
' 2. Gets position and angular tolerance statuses.
' 3. Gets face and volume comparison statuses.
' 4. Examine the Immediate window, graphics area, and C:\test\Report\gtReportIndex.htm.
' NOTE: Because the parts are used elsewhere, do not save changes.

using SOLIDWORKS.Interop.sldworks;

using SOLIDWORKS.Interop.swconst;

using SOLIDWORKS.Interop.gtswutilities;

using System;

using System.Diagnostics;

namespace SetTolerancesAndCompareGeometry_CSharp.csproj


    partial class SOLIDWORKSMacro


        PartDoc Part;

        public void Main()


            Part = (PartDoc)swApp.ActiveDoc;

            gtcocswUtilities swUtil = default(gtcocswUtilities);

            gtcocswCompareGeometry swUtilCompGeom = default(gtcocswCompareGeometry);

            gtcocswUtilOptions OUtils = default(gtcocswUtilOptions);

            string file1 = null;

            string file2 = null;

            string reportname = null;

            int errorcode = 0;

            double posTol = 0;

            double angTol = 0;

            bool AddToDesignBinder = false;

            bool OverwriteReport = false;

            reportname = "C:\\test\\Report";

            AddToDesignBinder = false;

            OverwriteReport = true;

            // Get pointer to SOLIDWORKS Utilities interface

            swUtil = (gtcocswUtilities)swApp.GetAddInObject("Utilities.UtilitiesApp");

            // Get pointer to SOLIDWORKS Compare Geometry tool

            swUtilCompGeom = (gtcocswCompareGeometry)swUtil.GetToolInterface((int)gtSwTools_e.gtSwToolGeomDiff, out errorcode);

            // Get SOLIDWORKS Utilities options

            OUtils = swUtil.options;

            posTol = 0.0001;

            // Meters

            angTol = 1E-06;

            // Radians

            // Set position tolerance

            errorcode = OUtils.SetPositionTolerance(posTol);

            Debug.Print("Position tolerance is set." + " gtError_e: " + errorcode);

            // Set angular tolerance

            errorcode = OUtils.SetAngularTolerance(angTol);

            Debug.Print("Angular tolerance is set." + " gtError_e: " + errorcode);


            int volDiffStatus = 0;

            int faceDiffStatus = 0;

            file1 = "C:\\Users\\Public\\Documents\\SOLIDWORKS\\SOLIDWORKS 2018\\samples\\tutorial\\swutilities\\bracket_a.sldprt";

            file2 = "C:\\Users\\Public\\Documents\\SOLIDWORKS\\SOLIDWORKS 2018\\samples\\tutorial\\swutilities\\bracket_b.sldprt";

            // Compare the geometry of the faces and volumes and save results to a report

            errorcode = swUtilCompGeom.CompareGeometry3(file1, "", file2, "", (int)gtGdfOperationOption_e.gtGdfFaceAndVolumeCompare, (int)gtResultOptions_e.gtResultSaveReport, reportname, AddToDesignBinder, OverwriteReport, ref volDiffStatus,

            ref faceDiffStatus);

            if (!(errorcode == (int)gtError_e.gtNOErr))


                Debug.Print("Error comparing geometries. Inspect gtError_e = " + errorcode + " in the API help.");


            diffStatus("Volume comparison", volDiffStatus);

            diffStatus("Face comparison", faceDiffStatus);

            // Perform any necessary cleanup

            errorcode = swUtilCompGeom.Close();




        public void diffStatus(string name, int diffCode)



            switch (diffCode)


                case (int)gtVolDiffStatusOptionType_e.gtSuccess:



                case (int)gtVolDiffStatusOptionType_e.gtNotPerformed:

                    Debug.Print("Not performed");


                case (int)gtVolDiffStatusOptionType_e.gtCanceled:



                case (int)gtVolDiffStatusOptionType_e.gtFailed:



                case (int)gtVolDiffStatusOptionType_e.gtIdenticalParts:

                    Debug.Print("Identical parts");


                case (int)gtVolDiffStatusOptionType_e.gtDifferentParts:

                    Debug.Print("Different parts");


                case (int)gtVolDiffStatusOptionType_e.gtNoSolidBody:

                    Debug.Print("No solid body found");


                case (int)gtVolDiffStatusOptionType_e.gtAlreadySaved:

                    Debug.Print("Already saved");





        public SldWorks swApp;



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