Contents - Index
3-D Plot Controls for 3-D Surface and 3-D Points Plots
The 3-D plot control panel can be made visible or hidden by double-clicking or right-clicking the mouse in the plot window. The Show/Hide Toolbar command in the Plot menu also provides this function.
The control panel for 3-D surface plots is shown below.
The Axes checkbox has 3 positions. Clicking in the box rotates through the positions. If the box is checked, X, Y, and Z axis lines are drawn through the plot origin with red, green, and blue dotted lines, respectively. If the box is checked with a white background, axis labels will be displayed to help identify the rotational position. If the box is unchecked, the axis lines are not drawn.
If the Perspective checkbox is checked, a perspective projection of the 3-D surface is displayed. If the box is not checked, orthogonal projection is employed. Perspective projection appears more correct to the eye but orthogonal projection is easier interpret.
The Color checkbox has three positions. If the box is unchecked, the surface is displayed with grayscale colors. The color can be controlled with the slider to the right of the color checkbox. If the box is checked, the value of Z (or the value of an optional color variable) is represented on the surface in colors that range from red to blue (check with gray background) or a full spectrum colors (check with white background) . The optional color variable is chosen in the X-Y-Z Plot Setup. If a variable is not chosen, the color variable is Z itself.
The Resolution slider controls the size of the polygons used to form the surface plot. High resolution (slider bar to the right) results in a crisp plot, but rendering and rotating may be sluggish. You may want to experiment with this control to determine a suitable compromise between display speed and quality.
Gridlines and Size
Slider controls are provided to separately control the size of the X, Y and Z axes. Moving the slider to the right increases the size for the selected axis. The slider can be moved with the mouse or with the left/right arrow keys. The check boxes for X and Y control the visibility of surface grid lines. The vertical slider scales the X, Y, and Z directions uniformly. Moving the slider down increases the apparent size of the plot in the window. This slider can also be controlled with the up/down arrow keys. The lower and upper limits of the plotting range can be changed for the X and Y axes by right-clicking on the slider control.
The option of displaying grids in each of the orthogonal planes is controlled with the checkboxes. For example, the grid in the YZ plane will be visible if the checkbox preceding X is checked. The grid can be moved to any position within the range of values chosen in the X-Y-Z Plot Setup using the mouse or the left/right arrow keys. The current location of the grid is shown in the box to the right of the slider. A value can be directly entered into this box which will cause the grid to move to the specified value.
Clicking the Top button will rotate the display so that the view is of the X-Y plane looking down the positive Z-axis towards the origin. The Front button presents a Y-Z plane viewed along the positive X axis. The Side button displays the X-Z plane from the positive Y axis.
Axis Scale and Labels
If the Axis scale values check box is checked, the lower and upper limits of the scales for the X, Y, and Z axes will be displayed.
If the Axis variable names check box is checked, the names of the variables plotted on the X, Y and Z axes will be displayed.
Clicking the Isometric button will orient the axes in an isometric manner that best shows the axis scale values and axis names.
The tool bar provide buttons to place text, lines, boxes, and circles on the plot in the same manner as for X-Y plot windows. An align button is also provided. The help button displays this page.
Holding the Shift and Ctrl keys down will cause the 3-D coordinates to be displayed in the window caption, provided that the X and Y-axis grids are visible. The information displayed is the current locations of the X and Y grids, followed by the value of Z on the surface for the given X and Y. If the color corresponds to a variable other than Z, its value on the surface at the specified X and Y is also shown. If the X and Y grids are moved using the mouse while the Shift and Ctrl keys are held down, the information in the window caption will be automatically updated.
The control panel for 3-D points plots is shown below.
The Color and Resolution controls are replaced with a Modify Plot button that allows the properties of the individual overlayed plots to be adjusted.