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Toggle Culling Back/Front

This removes the element faces of the volume elements pointing to the user, either of all elements or of the surface of the structure, depending on the state of ``Toggle Surfaces/Volumes''. With that option the user can visualize internal structures like cracks or a core of a hollow structure.
For shell elements the behavior is different. Initially only the front faces are lighted and the back faces are dark. This is helpful to determine the orientation of the elements. If you want to change the orientation use the command ``qflp''. If you just want to see all elements lighted then use this option.