title: ILNumerics plot with 3 coordinates
body: <p>I have 3 arrays of Rx, Ry, Rz of type float.
  I'm trying to plot a surface with following code:</p>
  
  <pre><code>        ILArray&lt;float&gt; y = Ry
          ILArray&lt;float&gt; x = Rx
          ILArray&lt;float&gt; z = Rz
          ILArray&lt;float&gt; Z = ILMath.zeros&lt;float&gt;(x.S[0], x.S[1], 3);
  
          Z[":;:;1"] = x;
          Z[":;:;2"] = y;
          Z[":;:;0"] = z;
  
          var scene = new ILScene {
              new ILPlotCube(twoDMode: false) {
                  new ILSurface(Z) {
                      Wireframe = { Color = Color.FromArgb(50, Color.LightGray) },
                      Colormap = Colormaps.Jet, 
                  }
             }
          };
          panel.Scene = scene;
  </code></pre>
  
  <p>But it draw nothing.
  Sample points:</p>
  
  <pre><code>z: 1 0,1111111 0,01111111 0,001010101 8,417508E-05 6,475007E-06 0,1111111 0,01388889 0,001984127
  x: 3 4 5 6 7 8 2 1 0 
  y: 4 4 4 4 4 4 4 4 4
  </code></pre>
  
  <p>I'm trying to draw a surface like that
  <a href="http://cs618230.vk.me/v618230086/7b18/Q2aQP0uMPUg.jpg" rel="nofollow">http://cs618230.vk.me/v618230086/7b18/Q2aQP0uMPUg.jpg</a></p>