Hidden3d

The set hidden3d command enables hidden line removal for explicit surface plotting (see splot). Hidden line removal may be used for both explicit functions and for explicit data where gnuplot plot is in nonparametric mode (see set parametric).

When this flag is set both the surface hidden portion and possibly its hidden contours (see set contour) as well as the hidden grid will be removed. Labels and arrows are always visible and are unaffected by this command.

Each surface has its hidden part removed with respect to itself, if more than one surface is ploted. This mode is meaningfull when surfaces are plotted using line style drawing only.

Syntax: 

        set hidden3d
        set nohidden3d
        show hidden3d