2D Visualization

I use Gridded2DSet to construct a 2D domain set and try to visualize the values at each node. It works fine but I can always see some triangles(I guess it is because of the interpolation used int Visad) if I use just small amounts of grids. How can get rid of these triangles? It will be better if I can see the squares instead of triangles when using just a few grids. Thanks so much.



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