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2.32 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 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 and ‘pm3d depthorder‘. 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 contour.

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