Texas Instruments Titanium TI-89 User Manual

3D Graphing 389
Effect of Changing eye
Effect of Changing eyeEffect of Changing eye
Effect of Changing eyef phi
phi phi
phi
By changing
eyef, you can elevate your viewing angle above the xy plane. If 90 < eyef <
270, the viewing angle is below the xy plane.
Note: This example starts on the xy plane (eyef = 90) and decrements eyef by 20 to
elevate the viewing angle.
Effect of Changing eye
Effect of Changing eyeEffect of Changing eye
Effect of Changing eyeψ psi
psi psi
psi
The view on the Graph screen is always oriented along the viewing angles set by
eyeq
and
eyef. You can change eyeψ to rotate the graph around that line of sight.
z1(x,y) = (x
3
y – y
3
x) / 390
In this example eye
q =
20
eyef = 90
eye
f = 70
eye
f = 50

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)