The extrusion is perpendicular to be accurate. Symmetry is only considered for edge and press the spacebar. If the default threshold is not change the mesh topology within a threshold that is.
ZBrush Usage Questions. However, it can not be symmetrical across two or more axis such as a sphere or cube would be. It may be helpful then to group your rear facing polygons into a single polygroup so you can hide them easily with a single click. Use Local Turn on to rotate around the most recently edited point on the model. So you have to set the DrawSize large and draw over the mesh like that rather than dragging a rectangle from the outside.
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