New
Even with the option "quality" selected, there is a small glitch in the redering the graph of f(x,y) = x^2 - y^2 (please, see the red arrow):
The glitch doesn't appear then the same surface generated with the Surface() command.
Files:
geogebra-bug-3d...
The same problem 
How is it in GeoGebra 6?
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