[Paraview] Glyph filters mask-points option only shows half side with vectors

[Carolin Helbig]

Hello,

I have got a problem with the behavior of the glyphs filter. I try to 
explain my approach and the problem:

- I calculated with the calculator filter: U*iHat + V*jHat
- After that I added the glyph filter
- If the "mask points" checkbox is NOT selected, all vectors are pictured
- If I select the checkbox "mask points", only half of the vectors are 
pictured
--> If I use the X+/- view it seams like only the vectors under the 
Y-axis or very close to it are shown
--> If I use the Y+/- view it seams like only the vectors under the 
X-axis or very close to it are shown

Does somebody know why there are only half of the vectors are shown if I 
use the "mask points" option?

Greetings,
Carolin.