The thickness command changes the separation between the hither and yon clipping planes by the specified increment, where increment is a real number in the current display units (usually angstroms). A positive number increases the distance between the clipping planes, whereas a negative number decreases it. This results in displaying an thicker or thinner cross section of the current model(s).
Thickness moves the clipping planes in the specified manner for the specified number of image update frames (default 1). Commands continue to be processed while the requested motion is in progress. To pause command processing until the motion is finished, use the wait command. To halt an ongoing thickness motion, use freeze.
See also: clip, section, the Side View, movie-related commands