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Set Tolerances and Compare Geometry (C#)


// This example shows how to set the tolerances and then compare the volume and geometry

// of two versions of the same part and save the volume comparison results as a solid 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 on the project in Project Explorer, Add Reference,

//     Browse to <SOLIDWORKS_install_dir>\api\redist\CLR2,

//     select Solidworks.Interop.gtswutilities.dll).

// 3. The specified files exist.

// 4. C:\test\ exists.

// 5. Change the namespace of this example to <Your_project_name>.csproj.


// Postconditions:


// 1. Geometry comparison report, C:\test\Report\gtReportIndex.htm, is created.

// 2. Position and angular tolerance statuses display in the Immediate Window.

// 3. Face and volume comparison statuses display in the Immediate Window.

// 4. Volume comparison part, C:\test\volumeComparison.sldprt, is created.


// NOTE: Do not save the parts as they are used in a SOLIDWORKS tutorial.


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;

            string savevol = null;

            int errorcode = 0;

            double posTol = 0;

            double angTol = 0;

            bool AddToDesignBinder = false;

            bool OverwriteReport = false;

            savevol = "C:\\test\\volumeComparison";

            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:\\Program Files\\SOLIDWORKS Corp\\SOLIDWORKS\\samples\\tutorial\\swutilities\\bracket_a.sldprt";

            file2 = "C:\\Program Files\\SOLIDWORKS Corp\\SOLIDWORKS\\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);

            // Save volume comparison results as a solid part

            errorcode = swUtilCompGeom.SaveCompareVolumeResults(savevol);

            // 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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