[Paraview] producing uniform velocity vector?

[Pei-Ying Hsieh]

Dear Paraview experts,

I am wondering how I can produce uniform velocity vector of the flow field using Glyph.  When I unchecked the "mask points", paraview plots vector at ALL points.  This is way too much for my case.  I would like to reduce the number of vectors.  However, if I selected the "Mask Points", then, some area has lots of vector, while some other areas have almost NO vector plotted.  I am looking for plotting the vectors in a "uniform" fashion across the whole flow domain.  I am wondering how I can achieve this.  Suggestions will be highly appreciated.

Pei-Ying
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