Invert normal

This command enables inverting the normal surface among the selected surfaces; by normal the surface side undergoing machining is meant.

The quickest way for realizing that the inversion has occurred is looking at the colour; indeed each surface always shows an lighter side and a darker side: the lighter side is the machinable side. By pressing this button the darker side and the lighter side are swapped. The operator must make sure that the lighter side corresponds to the surface side to be machined.

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