Texas-instruments PLUS TI-89 User Manual download pdf (Page 181)

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 2210_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

and

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:

nimate the graph incrementally Press and release the cursor

quickly.

Move along the viewing orbit:

Change the viewing orbit’s

elevation

(primarily increases

or decreases

eye

)

nimate the graph continuously Press and hold the cursor for

about 1 second, and then

release it.

To stop, press

, or



(space).

92 Plus

To stop, press

, or the space bar.

Change between 4 animation

speeds (increase or decrease the

incremental changes in the

eye

Window variables)

Press

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

alues

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,

ou 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

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Texas-instruments PLUS TI-89 User Manual Page 181

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