BACK_FACES Switch: Display of "Back" Faces of Solid and Thick Shell Elements

BACK_FACES switch: Display of back faces of solid and thick shell elements

To save graphics rendering effort the "back" faces of 3D elements (solids and thick shells) can be turned off. This is the default on 2D devices, but on 3D devices they are left on (in case the model is rotated to expose its back). The effect of this is shown in the figures below.