Modifying a Cylinder using Inventor API C#

[lokit.khemka]

I have the following code for obtaining the cylindrical faces in the open geometry. I want to modify the radius of the cylinder. How should I proceed with this?

 public static void HoleList(Inventor.Application mApplication)
    {
            PartDocument doc = (PartDocument)mApplication.ActiveDocument;
            PartComponentDefinition PartCompDef = doc.ComponentDefinition;

            SurfaceBody body = PartCompDef.SurfaceBodies[1];

            int holeCount = 0;
            int count = body.Faces.Count;

            foreach (Face face in body.Faces)
            {
                if (face.SurfaceType == SurfaceTypeEnum.kCylinderSurface)
                {
                    holeCount++;

                    Cylinder cylinder = (Cylinder)face.Geometry;
                    double ddepth = 0.0;
                    if (cylinder.AxisVector.Z == 1 || cylinder.AxisVector.Z == -1)
                    {
                        ddepth = System.Math.Abs(System.Math.Abs(face.Vertices[1].Point.Z) - System.Math.Abs(face.Vertices[2].Point.Z)) * 10;
                    }
                    else if (cylinder.AxisVector.Y == 1)
                    {
                        ddepth = System.Math.Abs(System.Math.Abs(face.Vertices[1].Point.Y) - System.Math.Abs(face.Vertices[2].Point.Y)) * 10;
                    }
                    else if (cylinder.AxisVector.X == 1)
                    {
                        ddepth = System.Math.Abs(System.Math.Abs(face.Vertices[1].Point.X) - System.Math.Abs(face.Vertices[2].Point.X)) * 10;
                    }

                    double diameter = 2 * cylinder.Radius;
                    Console.WriteLine("Diameter: " + cylinder.Radius * 2 * 10 + " mm" + "\t" + "Depth: " + ddepth + " mm");

                    foreach(Edge edge in face.Edges)
                    {
                        Console.WriteLine(edge.StartVertex.Point.X + " " + edge.StartVertex.Point.Y + " " + edge.StartVertex.Point.Z);
                        Console.WriteLine(edge.StopVertex.Point.X + " " + edge.StopVertex.Point.Y + " " + edge.StopVertex.Point.Z);
                    }
                }
            }
    }
  }

Any help will be greatly appreciated. Thank you.

[Michael.Navara]

You can't modify surface body directly in this way, but you can use ThickenFeature for this.

[lokit.khemka]

Hi. Can you provide a simple code example for this? I am new to this and I am unable to get ThickenFeature to work with the code.

[Michael.Navara]

This is simple iLogic sample how to create ThicknessFeature from all cylindrical faces

Sub Main()
    Dim part As PartDocument = ThisDoc.Document
    Dim partDef As PartComponentDefinition = part.ComponentDefinition

    'Iterate all faces in first surface body
    For Each face As Face In partDef.SurfaceBodies(1).Faces

        'Check if face is cylindrical face
        Dim cylinder As Cylinder = TryCast(face.Geometry, Cylinder)
        If cylinder Is Nothing Then Continue For
        
        'Get radius for future use. Not used yet
        Dim radius As Double = cylinder.Radius

        'Build face collection for each face
        Dim faceCollection As FaceCollection = ThisApplication.TransientObjects.CreateFaceCollection()
        faceCollection.Add(face)

        'Set offset/thickness distance. It can depend on current radius
        Dim distance As Double = 0.1 ' 1 mm

        'Create thickness feature
        Dim thicknessFeature = partDef.Features.ThickenFeatures.Add(
            faceCollection, 
            distance,
            PartFeatureExtentDirectionEnum.kPositiveExtentDirection, 
            PartFeatureOperationEnum.kJoinOperation, 
            False)
    Next
End Sub