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qflp

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

This keyword is used to invert the outer- and inner side (the orientation) of shell elements and surfaces. To invert surfaces and/or elements select in the main menu ``Viewing'' ``Show Elements With Light'' and eventually ``Toggle Culling Back/Front'' to see the back side of the elements without lighting. Then move the mouse pointer over one element and press the following keys: To flip just the selected Element type `` e''. Or type ``s'' to flip all elements that belongs to the same surface. This will also flip the definition of the underlying Surface. 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.