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Create Simulation Gravity Feature Example (C#)

This example shows how to create a simulation gravity feature in a motion study.

// Preconditions:  
// 1. Verify that the specified model document exists.
// 2. In SOLIDWORKS, verify that View > MotionManager is selected.
// 3. In the IDE, right-click the project name in the Project Explorer, 
//    click Add Reference, browse to install_dir\api\redist\CLR2, and select 
//    SolidWorks.Interop.swmotionstudy.dll.
// 4. Click OK.
// 5. Open an Immediate window.
// Postconditions: 
// 1. Adds Gravity to the MotionManager design tree on the Motion Study 1 tab.
// 2. Inspect the Immediate window.
// NOTE: Because the model is used elsewhere,
// do not save changes when closing it.

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using SolidWorks.Interop.swmotionstudy;
using System.Runtime.InteropServices;
namespace CreateSimGravFeat_CSharp.csproj
    partial class SolidWorksMacro
        ModelDoc2 swModel;
        ModelDocExtension swModelDocExt;
        MotionStudyManager swMotionMgr;
        MotionStudy swMotionStudy1;
        SimulationGravityFeatureData swGravityFeat;
        Feature swFeat;
        int longstatus;
        int longwarnings;
        public void Main()
            swModel = swApp.OpenDoc6("C:\\Users\\Public\\Documents\\SOLIDWORKS\\SOLIDWORKS 2018\\samples\\tutorial\\api\\beam_boltconnection.sldasm", 2, 0, ""ref longstatus, ref longwarnings);
            swApp.ActivateDoc2("beam_boltconnection"falseref longstatus);
            swModel = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExt = swModel.Extension;

            swMotionMgr = (MotionStudyManager)swModelDocExt.GetMotionStudyManager();
            swMotionStudy1 = swMotionMgr.GetMotionStudy("Motion Study 1");
            if ((swMotionStudy1 == null))
                Debug.Print("Motion Study 1 is not available");

            swMotionStudy1.StudyType = (int)swMotionStudyType_e.swMotionStudyTypePhysicalSimulation;
            // Activate Motion Study 1
            // Define feature data
            swGravityFeat = (SimulationGravityFeatureData)swMotionStudy1.CreateDefinition((int)swFeatureNameID_e.swFmAEMGravity);
            if (swGravityFeat == null)
                Debug.Print("Creation of feature data object failed");
            swGravityFeat.ReverseDirection = false;
            swGravityFeat.Axis = 0;
            swGravityFeat.Strength = 12;
            // Create feature
            swFeat = (Feature)swMotionStudy1.CreateFeature(swGravityFeat);
            if (swFeat == null)
                Debug.Print("Creation of feature failed");
                Debug.Print("Name of the feature added: " + swFeat.Name);
        /// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>
        public SldWorks swApp;


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