Texas Instruments TI-89 Voyage 200, User Manual

Page: 389 / 1008

3D Graphing 389
Effect of Changing eye
Effect of Changing eye Effect of Changing eye
Effect of Changing eye
f
phi
phi phi
phi
By changing
eye
f
, you can elevate your viewing angle above the xy plane. If
90 < eye
f
<
270
, the viewing angle is below the xy plane.
Note:
This example starts on the xy plane (
eye f = 90
) and decrements
eye f
by 20 to
elevate the viewing angle.
Effect of Changing eye
Effect of Changing eye Effect of Changing eye
Effect of Changing eye
ψ
psi
psi psi
psi
The view on the Graph screen is always oriented along the viewing angles set by
eye
q
and
eye f
. You can change
eye
ψ
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
eye f = 90
eye f = 70
eye f = 50