public override void Run(RenderControl render)
        {
            var material = MeshStandardMaterial.Create("metal-double");

            material.SetColor(new Vector3(1.0f, 0.8f, 0.0f));
            material.SetMetalness(0.8f);
            material.SetRoughness(0.5f);
            material.SetFaceSide(EnumFaceSide.DoubleSide);


            var startPt = new GVec(0, 100, 0);
            var points  = new GPntList();

            points.Add(new GPnt(startPt.XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(0, 0, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(0, 100, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(-100, 100, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(-100, 300, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(100, 300, 150)).XYZ()));
            TopoShape path = SketchBuilder.MakePolygon(points, false);

            var sectionList = new TopoShapeList();

            GAx2      coord1   = new GAx2(new GPnt(startPt.Added(new GVec(-25, -25, 0)).XYZ()), GP.DY());
            TopoShape section1 = SketchBuilder.MakeRectangle(coord1, 50, 50, 10, false);

            render.ShowShape(section1, ColorTable.Red);
            render.ShowShape(path, ColorTable.Green);

            TopoShape pipe = FeatureTool.SweepByFrenet(section1, path, EnumSweepTransitionMode.RoundCorner,
                                                       false);
            BufferShape bs = new BufferShape(pipe, material, null, 0.1f);

            bs.Build();
            var node = new BrepSceneNode(bs);

            render.ShowSceneNode(node);
        }
        public override void Run(RenderControl render)
        {
            var sketch = SketchBuilder.MakeEllipse(GP.Origin(), 5, 3, GP.DX(), GP.DZ());

            // 1. Sweep
            {
                GPntList points = new GPntList {
                    GP.Origin(), new GPnt(20, 10, 30), new GPnt(50, 50, 50),
                };
                var path = SketchBuilder.MakeBSpline(points);
                render.ShowShape(path, Vector3.Green);

                var feature = FeatureTool.Sweep(sketch, path, EnumGeomFillTrihedron.ConstantNormal);
                render.ShowShape(feature, Vector3.Blue);
            }

            // 2. Revol
            {
                var feature = FeatureTool.Revol(sketch, new GAx1(new GPnt(-20, 0, 0), GP.DY()), 90);

                render.ShowShape(feature, Vector3.Green);
            }
            // 3. Loft
            {
                var baseWire = SketchBuilder.MakeRectangle(new GAx2(new GPnt(50, -50, 0), GP.DZ()), 20, 20, 5, false);
                var topWire  = SketchBuilder.MakeCircle(new GPnt(60, -40, 40), 5, GP.DZ());

                var loft = FeatureTool.Loft(baseWire, topWire, true);
                render.ShowShape(loft, Vector3.Red);
            }
        }
        public override void Run(RenderControl render)
        {
            var startPt = new GVec(0, 100, 0);
            var points  = new GPntList();

            points.Add(new GPnt(startPt.XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(0, 0, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(0, 100, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(-100, 100, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(-100, 300, 150)).XYZ()));
            points.Add(new GPnt(startPt.Added(new GVec(100, 300, 150)).XYZ()));
            TopoShape path = SketchBuilder.MakePolygon(points, false);

            var sectionList = new TopoShapeList();

            GAx2      coord1   = new GAx2(new GPnt(startPt.Added(new GVec(-25, -25, 0)).XYZ()), GP.DY());
            TopoShape section1 = SketchBuilder.MakeRectangle(coord1, 50, 50, 10, false);

            render.ShowShape(section1, Vector3.Red);
            render.ShowShape(path, Vector3.Green);

            TopoShape pipe = FeatureTool.SweepByFrenet(section1, path, EnumSweepTransitionMode.RoundCorner,
                                                       false);

            render.ShowShape(pipe, Vector3.Blue);
        }