skipping data points

hi, 
i'm an engineering student at EPFL, Lausanne and am trying to display
the results of finite element calculations of fluid flow over a profile as
a 2D display. The input consists of vectors of node locations in the xy
plane and the corresponding values of the display parameter at each node.
The mesh is very fine near the profile and coarse away from it. I use the
Irregular2DSet for the purpose. 
The problem is that the resulting image does not show details, i.e. as if
most of the points in the finer parts of the mesh have been skipped. I
also tried to `clip' the data, i.e. remove all points (from the input
vectors) that lie outside a square which encloses the profile. To my
surprise, the image was detailed if the square was smaller than a certain
size which corresponded approximately to the finer part of the mesh. For a
square just larger than this size, the image looked like a coarse mosaic
showing no details. 
Please tell me what can be done to ensure a good image when a larger field
of view is required and also when different meshes are used.

Thanking you in advance,
Rohit.


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