Platform.LineStyle lineStyle = new Platform.LineStyle();

            lineStyle.SetLineWidth(0.5f);

            lineStyle.SetColor(ColorValue.BLUE);

            Platform.LineStyle lineStyle2 = new Platform.LineStyle();

            lineStyle2.SetLineWidth(0.5f);

            lineStyle2.SetColor(ColorValue.GREEN);

            Platform.TopoShape arc = renderView.ShapeMaker.MakeEllipseArc(Vector3.ZERO, , , , , Vector3.UNIT_Z);

            renderView.ShowGeometry(arc, );

            {

                Platform.GeomeCurve curve = new Platform.GeomeCurve();

                curve.Initialize(arc);

                float paramStart = curve.FirstParameter();

                float paramEnd = curve.LastParameter();

                float step = (paramEnd - paramStart) * 0.1f;

                for (float uu = paramStart; uu <= paramEnd; uu += step)

                {

                    Vector3 dir = curve.DN(uu, );

                    Vector3 pos = curve.Value(uu);

                    // 切线

                    {

                        Platform.TopoShape line = renderView.ShapeMaker.MakeLine(pos, pos + dir);

                        Platform.SceneNode node = renderView.ShowGeometry(line, );

                        node.SetLineStyle(lineStyle);

                    }

                    // 法线

                    {

                        Vector3 dirN = dir.CrossProduct(Vector3.UNIT_Z);

                        Platform.TopoShape line = renderView.ShapeMaker.MakeLine(pos, pos + dirN);

                        Platform.SceneNode node = renderView.ShowGeometry(line, );

                        node.SetLineStyle(lineStyle2);

                    }

                }

            }

            Platform.LineStyle lineStyle = new Platform.LineStyle();

            lineStyle.SetLineWidth(0.5f);

            lineStyle.SetColor(ColorValue.RED);

            TopoShape arc = renderView.ShapeMaker.MakeArc(Vector3.ZERO, , -, , Vector3.UNIT_X);

            TopoShape face = renderView.ShapeMaker.Extrude(arc, , Vector3.UNIT_X);

            renderView.ShowGeometry(face, );

            GeomeSurface surface = new GeomeSurface();

            surface.Initialize(face);

            float ufirst = surface.FirstUParameter();

            float uLarst = surface.LastUParameter();

            float vfirst = surface.FirstVParameter();

            float vLast = surface.LastVParameter();

            float ustep = (uLarst - ufirst) * 0.1f;

            float vstep = (vLast - vfirst) * 0.1f;

            for(float ii=ufirst; ii<=uLarst; ii+= ustep)

                for (float jj = vfirst; jj <= vLast; jj += vstep)

                {

                    Vector3List data = surface.D1(ii, jj);

                    Vector3 pos = data.Get();

                    Vector3 dirU = data.Get();

                    Vector3 dirV = data.Get();

                    Vector3 dir = dirV.CrossProduct(dirU);

                    {

                        Platform.TopoShape line = renderView.ShapeMaker.MakeLine(pos, pos + dir);

                        Platform.SceneNode node = renderView.ShowGeometry(line, );

                        node.SetLineStyle(lineStyle);

                    }

                }