Ruled Surface

Hi Author,

Do you have some example data of the edges?

Here is an example that makes a non-planer face of 4 edges: FaceFromEdges

​Or general face creation: MakeFaces

​Best regards, Commenter-1

Hi Guido,

Below are the sample code i used to make the face. And here while init the GeomFill_BSplineCurves, to use GeomFill_CoonsStyle to make ruled face, to make a ruled face i need NbUPoles and NbVPoles greater than 4 to construct the face, but i get 2 for NbVPoles. I have attached a text file which contains sample data.

TopExp_Explorer anExp(mw.Wire(), TopAbs_EDGE);
            for (; anExp.More(); anExp.Next())
            {
                const TopoDS_Edge& edge = TopoDS::Edge(anExp.Current());
                TopLoc_Location heloc; // this will be output
                Handle(Geom_Curve) c_geom = BRep_Tool::Curve(edge, heloc, u1, u2); //The geometric curve
                Handle(Geom_BSplineCurve) b_geom = Handle(Geom_BSplineCurve)::DownCast(c_geom); //Try to get BSpline curve

                if (!b_geom.IsNull())
                {
                    gp_Trsf transf = heloc.Transformation();
                    b_geom->Transform(transf); // apply original transformation to control points
                    //Store Underlying Geometry
                    crvs.push_back(b_geom);
                }
                else
                {
                    // try to convert it into a b-spline
                    BRepBuilderAPI_NurbsConvert mkNurbs(edge);
                    TopoDS_Edge nurbs = TopoDS::Edge(mkNurbs.Shape());
                    // avoid copying
                    TopLoc_Location heloc2; // this will be output
                    Handle(Geom_Curve) c_geom2 = BRep_Tool::Curve(nurbs, heloc2, u1, u2); //The geometric curve
                    Handle(Geom_BSplineCurve) b_geom2 = Handle(Geom_BSplineCurve)::DownCast(c_geom2); //Try to get BSpline curve

                    if (!b_geom2.IsNull())
                    {
                        gp_Trsf transf = heloc2.Transformation();
                        b_geom2->Transform(transf); // apply original transformation to control points
                        //Store Underlying Geometry
                        crvs.push_back(b_geom2);
                    }
                    else
                    {
                        // BRepBuilderAPI_NurbsConvert failed, try ShapeConstruct_Curve now
                        ShapeConstruct_Curve scc;
                        Handle(Geom_BSplineCurve) spline = scc.ConvertToBSpline(c_geom, u1, u2, Precision::Confusion());
                        if (spline.IsNull())
                            Standard_Failure::Raise("A curve was not a b-spline and could not be converted into one.");
                        gp_Trsf transf = heloc2.Transformation();
                        spline->Transform(transf); // apply original transformation to control points
                        crvs.push_back(spline);
                    }
                }
            }

            GeomFill_FillingStyle fstyle = GeomFill_FillingStyle::GeomFill_CoonsStyle; // getFillingStyle();
            GeomFill_BSplineCurves aSurfBuilder; //Create Surface Builder

            std::size_t edgeCount = crvs.size();
            if (edgeCount == 2)
            {
                aSurfBuilder.Init(crvs[0], crvs[1], fstyle);
            }
            else if (edgeCount == 3)
            {
                aSurfBuilder.Init(crvs[0], crvs[1], crvs[2], fstyle);
            }
            else if (edgeCount == 4)
            {
                aSurfBuilder.Init(crvs[0], crvs[1], crvs[2], crvs[3], fstyle);
            }

            const Handle(Geom_BSplineSurface)& surf = aSurfBuilder.Surface();

            BRepLib_MakeFace mf(surf, mw.Wire());
            auto face = mf.Face();
            BRepAdaptor_Surface surAdapt(face);
            auto edgeType = surAdapt.GetType();

            builder.Add(shell, face);

Thanks and regards

Author Kumar

Hi Author, I have put your data (from Geometry.txt) in BRepFill_Filling and got following result:

See: Make Face From Edges

Is this the shape you wanted?

Hi Guido,

Yes this is the shape i need. Can you please share the code to make the face.

Regards,

Author Kumar

Hi Author,

You can see the code in the "Script" tab next to the "View" tab.

See: FaceFromEdges2

​You can also change the code to do experiments, and recompile the script, or open other example scripts.

The scripts are in c#, to use them in c++ you have to modify them a little: remove OC prefix for OCC classes, and remove "new" keyword

See: https://www.youtube.com/watch?v=I23dHBHc1BA

​Best regards, Commenter-1

Hi Guido,

Thank you very much for your replay.

Thanks and regards,

Author Kumar

Hi,

To create ruled face now I am using BRepFill_Filling method. It is working file, if the number of edges in a edge array is four. If the edge count exceeds then it connot build the ruled face. Is there any method to make it happen.

Thanks and Regards

Author kumar