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qflp

       'qflp' RETURN 'w'|'e'|'s'|'a'|'i'|'q'

This keyword is used to invert the outer- and inner side (the orientation) of shell-elements and surfaces. The orientation of shell-elements or surfaces can be seen by the color of the interior. The outer face reflects light, if the face is dark-grey it is the back-side. If ``Toggle Culling Back/Front'' was selected before then both sides are illuminated. To flip the orientation of a surface and all related shell-elements select either a shell-element with the ``e'' key or if the illuminated surfaces are displayed select the surface with the ``s'' key. If only elements are in the database flip them with the ``e'' key. Choose all in range with the ``a'' key or individuals with the ``i'' key before. Press ``q'' to quit the command.

It is also possible to measure distances between two pixels on the screen. Just press the key ``w'' on the positions of the two pixels. The distance is calculated in the scale of the displayed geometry.