<div>Hello NG,</div>
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<div> thanks to Amy, John, Goodwin and Prabhu I solved the problem of vtkThreshold (I think :-) ). Now everything seems OK, except one small thing. I have a vtkUnstructuredGrid in which I have some scalars. Now, irrespective of which scalar I am visualizing, I get strange visualization effects when I rotate/zoom the vtkUnstructuredGrid. For example and for comparison, please see the 2 pictures here:
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<div><a href="http://xoomer.virgilio.it/infinity77/AlmostOK.JPG">http://xoomer.virgilio.it/infinity77/AlmostOK.JPG</a></div>
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<div><a href="http://xoomer.virgilio.it/infinity77/SomethingWrong.JPG">http://xoomer.virgilio.it/infinity77/SomethingWrong.JPG</a></div>
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<div>They are showing exactly the same grid with the same scalars, but in the second one there are strokes of green that should not be there...</div>
<div>Does anyone know what I am doing wrong? May it be a light problem?</div>
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<div>Thank you very much for your help and suggestions.</div>
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<div>Andrea.<br clear="all"><br>-- <br>"Imagination Is The Only Weapon In The War Against Reality."<br><br><a href="http://xoomer.virgilio.it/infinity77/">http://xoomer.virgilio.it/infinity77/</a><br> </div>