Texas Instruments TITANIUM TI-89 - Manual (Page 388)

3D Graphing 388
Effect of Changing eye Effect of Changing eye Effect of Changing eye Effect of Changing eye
q
theta theta theta theta
The view on the Graph screen is always oriented along the viewing angle. From this
point of view, you can change
eye q to rotate the viewing angle around the z axis.
Note: This example increments eye q by 30.
z1(x,y) = (x
3
y – y
3
x) / 390
In this example eye f =
70
eye q = 20
eye q = 50
eye q = 80