3D Graphing 375
Effect of Changing eyef 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 eyeψ 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
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