clipping

Syntax:

     set pm3d {clip | clip1in | clip4in}
     set pm3d {no}clipcb

The component quadrangles of a pm3d surface or other 3D object are by default smoothly clipped against the current zrange. This is a change from earlier gnuplot versions. In 2D projection (set view map) this mode also clips against xrange and yrange.

Alternatively, surfaces can be clipped by rendering whole quadrangles but only those with all 4 corners in-range on x, y, and z (set pm3d clip4in), or only those with at least one corner in-range on x, y, and z (set pm3d clip1in). The options clip, clip1in, and clip4in are mutually exclusive.

Separate from clipping based on spatial x, y, and z coordinates, quadrangles can be rendered or not based on extreme palette color values. clipcb: (default) palette color values < cbmin are treated as cbmin; palette color values > cbmax are treated as cbmax. noclipcb: quadrangles with color value outside cbrange are not drawn at all.