Exploring Data in Three Dimensions

Rotating Plot Properties

This section describes the property tabs associated with a rotating plot. To access the rotating plot properties, right-click near the center of a plot, and select Plot Area Properties from the pop-up menu.

Tabs not discussed in this chapter are discussed in Chapter 9, "General Plot Properties."

The Surface Tab

The Surface tab (Figure 7.4) controls attributes of the rotating plot. You can use the Surface tab to control the placement of axes, the type of surface that is drawn, and whether contours of the data are shown in the (X,Y) plane.
Axis Locations
specifies the location of axes.
At midpoint
specifies that the origin of each axis is placed at the midpoint of the range of the variable for that axis.
At minima
specifies that the origin of each axis is placed at the minimum value of the variable for that axis.
3 sections
specifies that each axis is placed on an edge of the bounding cube surrounding the data so that the axis interferes as little as possible with viewing the data.
Off
specifies that no axes are displayed.
Surface Drawing Modes
specifies the attributes of the surface added to the rotating plot.
Transparent mesh
specifies that the surface is drawn as a wire mesh, but hidden-line removal is not performed.
Opaque mesh
specifies that the surface is drawn as a wire mesh and hidden-line removal is performed.
Block color mesh
specifies that the surface is drawn as a patch of rectangles in which each rectangle is a single color.
Smooth color mesh
specifies that the surface is drawn as a patch of triangles in which each triangle is a single color.
Stacked contours
specifies that the surface is not drawn, but that contour levels are drawn.
Stacked contours mesh
specifies that the surface is drawn as for Opaque mesh and also that contour levels are added as for Stacked contours.
Off
specifies that no surface is displayed.
Contour Projections
specifies whether contours of the data are shown in the (X,Y) plane.
Show contour lines
specifies that contours for the surface are shown projected onto the (X,Y) plane.
Show contour areas
specifies that region between projected contours are filled with color.
Show contour values
specifies whether projected contour lines are labeled by the value of the Z axis variable.

The Contours Tab

The Contours tab controls attributes of the projected contours for the surface. The Contours tab is described in the section "Contour Plot Properties".

The Grid Tab

The Grid tab (Figure 7.12) controls the size and color of the grid used to construct a surface and to compute contours for the surface.
Show grid
specifies whether to display a grid on the displayed surface.
Colors
specifies the color of the grid when seen from the front (positive Z direction) or back (negative Z direction).
Resolution
specifies the resolution of the computational grid used to fit a surface to the data. The algorithm that computes the surface uses a grid superimposed on the (X,Y) plane. This grid consists of evenly spaced subdivisions along the X and Y axes. Generally, having more subdivisions results in a smoother surface, whereas having fewer subdivisions results in a rougher surface.


ugthreedrotgridtab.png (6276 bytes)

Figure 7.12: The Grid Tab


The Observations Tab

The Observations tab (Figure 7.5) controls the attributes of markers in the rotating plot.

The Observations tab for the rotating plot contains all the controls documented in the section "Scatter Plot Properties". In addition, the Observations tab for the rotating plot includes the following check boxes:

Show rays
specifies whether lines are drawn from the center of the bounding cube to each observation marker.
Show depth perception
specifies whether observation markers are drawn in varying sizes to indicate their distance from the viewer.

The Reference Lines Tab

The Reference Lines tab (Figure 7.6) controls the attributes of reference lines in the rotating plot.

The Reference Lines tab for the rotating plot contains all the controls documented in the section "The Reference Lines Tab". In addition, the Reference Lines tab for the rotating plot includes the following check box:

Show Z reference lines
specifies whether to show reference lines for the Z axis.

The Plot Area Tab

The Plot Area tab (Figure 7.7) controls the attributes of plot area in the rotating plot.
Background
specifies the color of the background of the plot area.
Show plot frame box
specifies whether to display a framing box surrounding the plot area.
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