How The Viewing Angle Is Measured - Texas Instruments TITANIUM TI-89 User Manual

How the Viewing Angle Is Measured

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