Profiles Profs = Pdoc.ProfileSets.Add().Profiles;
Profile Prof = Profs.Add(TopPln);  // Plane selection
Relations2d Rels = (Relations2d)Prof.Relations2d;
Dimensions Dim = (Dimensions)Prof.Dimensions;

const double OD = 1.6;
const double height = 0.480;
const double angle = 60 * (Math.PI / 180);
const double thick = 0.006;

Circle2d c1 = Prof.Circles2d.AddByCenterRadius(0, 0, OD / 2.0);
Line2d LV = (Line2d)Prof.ProjectRefPlane(FrontPln);
Rels.AddKeypoint(c1, (int)igCircleCenter, LV, (int)igLineMiddle);

Dimension dimOD = Dim.AddCircularDiameter(c1);
dimOD.Constraint = true;
dimOD.TrackDistance = 0.015;

int stat = Prof.End(ProfileValidationType.igProfileClosed);
Debug.Assert(stat == 0);

//Create a Extruded surface
Profile[] profArr = new Profile[] { Prof };
// ExtrudedSurface mdl = Pdoc.Constructions.ExtrudedSurfaces.AddFinite(1, profArr, FeaturePropertyConstants.igRight, height);

ExtrudedSurface mdl = Pdoc.Constructions.ExtrudedSurfaces.Add(
NumberOfProfiles: 1,
ProfileArray: profArr,
ExtentType1: SolidEdgePart.FeaturePropertyConstants.igFinite,
ExtentSide1: SolidEdgePart.FeaturePropertyConstants.igRight,
FiniteDepth1: height,
TreatmentDraftSide1: SolidEdgePart.DraftSideConstants.seDraftInside,
TreatmentDraftAngle1: angle
);

//Create a Thicken feature

Model mdl2 = Pdoc.Models.AddThickenFeature(FeaturePropertyConstants.igRight, thick, 1, profArr);
Application.Exit();