disappearing details of object in 3D view
To summarize the situation, my geogebra window looks like it has a V shaped white mask in the 3D graphic window around the two bottom corners (and sometimes at the top, too). When an object spreads the whole window, this mask "covers" it particularly, so that the "covered" field can't be seen. However, when rotating the object (with that same zoom parameter given before), the disappeared parts move with, like they were part of the object, not the window.
Please see the attached screens.
Have anybody ever experienced similar things? How to solve?
Thanks a lot!