[Gnuplot-info] how to plot CFD contour data of unstructured mesh with lines

[killtimm <ti...@16...>]

I have a 2D unstructured mesh datafile which has the following format (for
each cell, x1, x2 and x3 are different, so are with y values ):

x1 y1 Mach1
x2 y2 Mach2
#blank                                            (for cell 1)
x3 y3 Mach3
x3 y3 Mach3
#blank 
#blank
x1 y1 Mach1
x2 y2 Mach2
#blank                                             (for cell 2)
x3 y3 Mach3
x3 y3 Mach3
#blank
#blank 

...... ......                                          (for cell N)

It's ok that a colored contour map could be made with pm3d
But I want to plot a contour with just isolines like below:
http://old.nabble.com/file/p26932610/Ma_1part.jpg 

I tried to do it using dgrid3d, but it will be impossible if the mesh is
very large to consume too much memory for interpolation calculating. 
And the result is often far from satisfactory.

Anxious for your answers.  Thanks in advance

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