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3D Graphing 381
8 Í
to set
Coordinates = POLAR.
Tool For 3D Graphs:
Free-Moving
Cursor
The free-moving cursor is not available.
„ Zoom
Works essentially the same as it does for function graphs,
but remember that you are now using three dimensions
instead of two.
• Only the following zooms are available:
2:ZoomIn, 3:ZoomOut, 5:ZoomSqr, 6:ZoomStd,
A:ZoomFit, B:Memory, C:SetFactors
•Only x (xmin, xmax), y (ymin, ymax), and z (zmin,
zmax) Window variables are affected.
• The
grid (xgrid, ygrid) and eye (eyeq, eyef, eyeψ)
Window variables are not affected unless you select
6:ZoomStd (which resets these variables to their standard
values).
… Trace
Lets you move the cursor along a grid wire from one grid
point to the next on the 3D surface.
• When you begin a trace, the cursor appears at the
midpoint of the xy grid.
• QuickCenter is available. At any time during a trace,
regardless of the cursor’s location, you can press
¸ to
center the viewing cube on the cursor.
• Cursor movement is restricted in the x and y directions.
You cannot move the cursor beyond the viewing cube
boundaries set by
xmin, xmax, ymin, and ymax.