Texas Instruments TI-89 Titanium User Manual page 378

Effect of Changing
By changing f, you can elevate your viewing angle above the xy plane. If
eye
, the viewing angle is below the xy plane.
270
3 3
z1(x,y) = (x y – y
This example starts on the xy plane (
Note:
elevate the viewing angle.
Effect of Changing
The view on the Graph screen is always oriented along the viewing angles set by
and f. You can change
eye
3D Graphing
eyef phi
x) / 390
eye
eye
eye
eyeψ psi
ψ to rotate the graph around that line of sight.
eye
In this example eye
20
= 90
f
f = 70
f = 50
) and decrements
eye f = 90
90 < eye
q =
f by 20 to
eye
<
f
eye
q
375