3D Graphing 373
How the Viewing Angle Is Measured
Note: When eyeψ=0, the z axis is vertical on the screen. When eyeψ=90, the z axis is
rotated 90¡ counterclockwise and is horizontal.
In the Window Editor (8$), always enter
eyeq, eyef, and eyeψ in degrees,
regardless of the current angle mode.
The viewing angle has three components:
•
eyeq — angle in degrees from the
positive x axis.
•
eyef — angle in degrees from the
positive z axis.
•
eyeψ — angle in degrees by which the
graph is rotated counter-clockwise
around the line of sight set by
eyeq
and
eyef.
Y
Z
X
eyeq
eyef
eye
Do not enter a ¡symbol. For
example, type 20, 70, and
0, not 20
¡, 70¡ and 0¡.
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