surface of the cylinder

[GoTryCatch]

Friends, I broke my brain. How do I draw the surface of the cylinder (like in picture 1)?
I only succeed (Figure 2). The code is simple, but I don’t understand what doesn’t work. Maybe there are working examples of how to do this for IFC4 C # ?

static void Main(string[] args)
        {
            var db = new DatabaseIfc(ModelView.Ifc4DesignTransfer);
            var site = new IfcSite(db, "Simple Site");
            var project = new IfcProject(site, "Simple Project", IfcUnitAssignment.Length.Metre) { };
            var building = new IfcBuilding(site, "Simple Building") { };
            var buildingStorey = new IfcBuildingStorey(building, "Simple Storey", 0);
            var material = new IfcMaterial(db, "Steel");
            var relAssMaterial = new IfcRelAssociatesMaterial(material);
            var geometricRepresentationContext = new IfcGeometricRepresentationContext(3, new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 0)));
            
            IfcCircleProfileDef circle = new IfcCircleProfileDef(db, "Cone", 40);                                             
            IfcExtrudedAreaSolid extrudedAreaSolid = new IfcExtrudedAreaSolid(circle, new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 0 )), new IfcDirection(db, 0, 0, 1), 20);
            IfcSurfaceOfLinearExtrusion surfaceLinearExtrusion = new IfcSurfaceOfLinearExtrusion(extrudedAreaSolid.SweptArea, new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 0)), 20);

            // boundaries
            IfcEllipse arc1 = new IfcEllipse(new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 0)), 40, 40);
            IfcTrimmedCurve trimmedArc1 = new IfcTrimmedCurve(arc1, new IfcTrimmingSelect(new IfcCartesianPoint(db, 40,0, 0)), new IfcTrimmingSelect(new IfcCartesianPoint(db, -40, 0, 0)), true, IfcTrimmingPreference.CARTESIAN);
            IfcLine line1 = new IfcLine(new IfcCartesianPoint(db, -40,0,0), new IfcVector(new IfcDirection(db, 0, 0, 1), 0));
            IfcTrimmedCurve trimmedLine1 = new IfcTrimmedCurve(line1, new IfcTrimmingSelect(0), new IfcTrimmingSelect(20), true, IfcTrimmingPreference.PARAMETER);
            IfcEllipse arc2 = new IfcEllipse(new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 20)), 40, 40);
            IfcTrimmedCurve trimmedArc2 = new IfcTrimmedCurve(arc2, new IfcTrimmingSelect(new IfcCartesianPoint(db, -40, 0, 20)), new IfcTrimmingSelect(new IfcCartesianPoint(db, 40, 0, 20)), false, IfcTrimmingPreference.CARTESIAN);
            IfcLine line2 = new IfcLine(new IfcCartesianPoint(db, 40, 0, 20), new IfcVector(new IfcDirection(db, 0, 0, -1), 0));
            IfcTrimmedCurve trimmedLine2 = new IfcTrimmedCurve(line2, new IfcTrimmingSelect(0), new IfcTrimmingSelect(20), true, IfcTrimmingPreference.PARAMETER);
            var segments = new List<IfcCompositeCurveSegment>();
            segments.Add(new IfcCompositeCurveSegment(IfcTransitionCode.CONTINUOUS, true, trimmedArc1));
            segments.Add(new IfcCompositeCurveSegment(IfcTransitionCode.CONTINUOUS, true, trimmedLine1));
            segments.Add(new IfcCompositeCurveSegment(IfcTransitionCode.CONTINUOUS, true, trimmedArc2));
            segments.Add(new IfcCompositeCurveSegment(IfcTransitionCode.CONTINUOUS, true, trimmedLine2));
            IfcCompositeCurve finalCurve = new IfcCompositeCurve(segments);

            List<IfcFaceBound> bounds = new List<IfcFaceBound>();
            IfcEdgeCurve edgeCurve  = new IfcEdgeCurve(new IfcVertexPoint(new IfcCartesianPoint(db, 0, 0, 0)), 
                                                     new IfcVertexPoint(new IfcCartesianPoint(db, 0, 0, 0)),
                                                     finalCurve,       
                                                     true);

            bounds.Add(new IfcFaceBound(new IfcEdgeLoop(new IfcOrientedEdge(edgeCurve, true)), true));

            IfcFaceSurface faceSurface = new IfcFaceSurface(bounds, surfaceLinearExtrusion, true);
            var brep = new IfcFacetedBrep(new IfcClosedShell(new List<IfcFace> { faceSurface }));
            IfcProductDefinitionShape rep = new IfcProductDefinitionShape(new List<IfcShapeRepresentation>() { new IfcShapeRepresentation(brep),new IfcShapeRepresentation(finalCurve) });
            IfcBuildingElementProxy buildingElementProxy = new IfcBuildingElementProxy(buildingStorey, new IfcLocalPlacement(new IfcAxis2Placement3D(new IfcCartesianPoint(db, 0, 0, 0))), rep);

            db.WriteFile("C:\\testoBrep.ifc");static void Main(string[] args);
}