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3D (surface) plots
Surface plots are generated using the splot command rather than the plot
command. The style with lines draws a surface made from a grid of lines.
Solid surfaces can be drawn using the style with pm3d.
Usually the surface is displayed at some arbitrary viewing angle,
such that it clearly represents a 3D surface. In this case the X, Y, and Z
axes are all visible in the plot. The illusion of 3D is enhanced by choosing
hidden line removal or depth-sorted surface elements.
See hidden3d (p.
) and the depthorder (p.
) option of set pm3d (p.
).
The splot command can also calculate and draw contour lines corresponding
to constant Z values. These contour lines may be drawn onto the surface
itself, or projected onto the XY plane. See set contour (p.
).
An important special case of the splot command is to map the Z coordinate
onto a 2D surface by projecting the plot along the Z axis. See set view map (p.
).
This plot mode can be used to generate contour plots and heat maps.
Next: Commands
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2013-02-05