Colormap in wireframe display mode

In case you would display your mesh in wireframe with its colormap as well like the following picture:

you should create the a new custom Mesh-derived class, that overrides method DrawWireframe().

This sample has been created starting from FunctionPlot sample, you will find the new Mesh-derived class called MyMesh, at the bottom of this code.

    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 

             // viewportLayout1.Unlock(""); // For more details see 'Product Activation' topic in the documentation. 
        } 

        private void Form1_Load(object sender, EventArgs e) 
        { 
            viewportLayout1.DisplayMode = displayType.Wireframe; 
            viewportLayout1.Grid.AutoSize = true; 
            viewportLayout1.Grid.Step = 1; 

            const int rows = 50; 
            const int cols = 50; 
            const double scale = 4; 

            List<PointRGB> vertices = new List<PointRGB>(rows * cols); 

            Mesh surface = new Mesh(); 

            surface.NormalAveragingMode = meshNormalAveragingType.Averaged; 

            for (int j = 0; j < rows; j++) 

                for (int i = 0; i < cols; i++) 
                { 

                    double x = i / 5.0; 
                    double y = j / 5.0; 

                    double f = 0; 

                    double den = Math.Sqrt(x * x + y * y); 

                    if (den != 0) 

                        f = scale * Math.Sin(Math.Sqrt(x * x + y * y)) / den; 

                    // generates a random color 
                    int red = (int)(255 - y * 20); 
                    int green = (int)(255 - x * 20); 
                    int blue = (int)(-f * 50); 

                    // clamps color values lat 0-255 
                    Utility.LimitRange<int>(0, ref red, 255); 
                    Utility.LimitRange<int>(0, ref green, 255); 
                    Utility.LimitRange<int>(0, ref blue, 255); 

                    vertices.Add(new PointRGB(x, y, f, (byte)red, (byte)green, (byte)blue)); 

                } 

            List<SmoothTriangle> triangles = new List<SmoothTriangle>((rows - 1) * (cols - 1) * 2); 

            for (int j = 0; j < (rows - 1); j++) 

                for (int i = 0; i < (cols - 1); i++) 
                { 

                    triangles.Add(new SmoothTriangle(i + j * cols, 
                                                          i + j * cols + 1, 
                                                          i + (j + 1) * cols + 1)); 
                    triangles.Add(new SmoothTriangle(i + j * cols, 
                                                          i + (j + 1) * cols + 1, 
                                                          i + (j + 1) * cols)); 
                } 

            surface.Vertices = vertices.ToArray(); 
            surface.Triangles = triangles.ToArray(); 

            MyMesh mesh = new MyMesh(surface); 

            // you need to turn off your mesh edges
            mesh.EdgeStyle = meshEdgeStyleType.None; 

            viewportLayout1.Entities.Add(mesh); 

            // fits the model in the viewportLayout1 
            viewportLayout1.ZoomFit(); 
        }                  
    } 

    class MyMesh : Mesh 
    { 
        public MyMesh(Mesh another) 
            : base(another) 
        { 
        } 

        protected override void DrawWireframe(DrawParams drawParams) 
        { 
            gl.PushAttrib(gl.CURRENT_BIT); 

            gl.CallList(drawList); 

            gl.PopAttrib(); 
        } 

        protected override void DrawIsocurves() 
        { 
            //base.DrawIsocurves(); 
        } 
    }