Texas Instruments TITANIUM TI-89 - Manual (Page 390)

3D Graphing 390
Note: During rotation, the axes expand or contract to fit the screen’s width and height.
This causes some distortion as shown in the example.
z1(x,y)=(x
3
y–y
3
x) / 390
In this example,
eye q =20 and eye f =70
eye
ψ
= 0
eye
ψ
= 45
eye
ψ
= 90
When eye
ψ
=0 , the z axis runs the height of
the screen.
When eye
ψ
=90 , the z axis runs the width of
the screen.
z=10
z= ë 10
z=10 z= л 10