Animating a 3d graph interactively, The viewing orbit, Animating the graph – Texas Instruments PLUS TI-89 User Manual

Page 181: Animating a series of graph pictures

164 Chapter 10: 3D Graphing

10_3D.DOC TI-89/TI-92 Plus: 3D Graphing (English) Susan Gullord Revised: 02/23/01 11:00 AM Printed: 02/23/01 4:22 PM Page 164 of 22

When using A and B to animate a graph, think of it as moving the
viewing angle along its “viewing orbit” around the graph.

Moving along this orbit can
cause the z axis to wobble
slightly during the animation
(as you can see in the preview
example on page 154).

To:

Do this:

Animate the graph incrementally

Press and release the cursor
quickly.

Move along the viewing orbit: A or B

Change the viewing orbit’s

elevation

(primarily increases

or decreases

eye

)

: C or D

Animate the graph continuously

Press and hold the cursor for
about 1 second, and then
release it.

To stop, press N,

¸, ´, or ¥ (space).

92 Plus

To stop, press N,

¸, ´, or the space bar.

Change between 4 animation
speeds (increase or decrease the
incremental changes in the

eye

Window variables)

Press « or |.

Change the viewing angle of a non-
animated graph to look along the x,
y, or z axis

Press

, respectively.

Return to the initial

eye

angle

values

Press 0
(zero, not the letter O).

You can also animate a graph by saving a series of graph pictures
and then flipping (or cycling) through those pictures. Refer to
“Animating a Series of Graph Pictures” in Chapter 12: Additional
Graphing Topics. This method gives you more control over the
Window variable values, particularly

eye

(page 162), which rotates

the graph.

Animating a 3D Graph Interactively

After plotting any 3D graph, you can change the viewing angle
interactively by using the cursor. Refer to the preview example
on page 154.

The Viewing Orbit

Note: The viewing orbit
affects the eye Window
variables in differing
amounts.

Animating the
Graph

Note: If the graph is shown
in expanded view, it returns
to normal view automatically
when you press a cursor
key.

Tip: After animating the
graph, you can stop and
then re-start the animation
in the same direction by
pressing:

89:

92 Plus:

or space

bar

Tip: During an animation,
you can switch to the next
graph format style by
pressing:

89:

92 Plus:

Tip: To see a graphic that
shows the eye angles, refer
to page 162.

Animating a Series
of Graph Pictures

This manual is related to the following products:

PLUS TI-92