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30 Chapter 2: Viewing and Navigating 3D Space
of changing FOV is similar to changing the lens on
a camera. As FOV gets larger you see more of your
scene and perspective b ecomes distorted, similar
to using a wide-angle lens. As FOV gets smaller
you see less of your scene and the perspect ive
flattens, similar to using a telephoto lens.
Wa rni ng: Be cautious using extreme Field of View
settings. These can produce unexpected results.
Zooming a R egion
Click Zoom Region (page 3–785) to drag a
rectangular region within the active viewport and
magnify that region to fill the viewport. Zoom
Region is available for all standard views.
In a perspective view port, Zoom Region
mode is available from the
Field of View flyout
(page 3–784)
.
Zoo min g t o E xt en ts
Click the Zoom Extents or Zoom Extents
All flyout buttons to change the magnification
and position of your v iew to display the extents
of objects in your scene. Your view is centered on
the objects and the magnification changed s o the
objects fill the viewport.
•
The Zoom Extents, Zoom Extents Selected
buttons (page 3–780)
zoomtheactiveviewport
to the extents of all visible or selected objects
in the scene.
•
The Zoom Extents All, Zoom Extents
All Selected buttons (page 3–780)
zoom all
viewportstotheextentsofallobjectsorthe
current select ion.
Pann ing a View
Click Pan View (page 3–786) and drag in
a viewport to move your view parallel to the
view por t plane. You can also pan a view por t by
draggingwiththemiddlemousebuttonhelddown
while any tool is active.
Rota ting a View
Click Arc Rotate, Arc Rotate on Selection, or
Arc Rotate Sub-Objec t (page 3–787)
to rotate your
view around the view center, the selection, or the
current sub-object selec tion respectively. When
you rotate an orthogonal view, such as a Top view,
it is converted to a User view.
With Arc Rotate, if objects are near the edges of
the viewport they might rotate out of view.
With Arc Rotate Selected, selected objects
remainatthesamepositionintheviewportwhile
the view rotates around them. If no objects are
selected, the function reverts to the standard Arc
Rotate.
With Arc Rotate Sub-Object, selected
sub-objects or objects remain at the same position
intheviewportwhiletheviewrotatesaround
them.
Note: Yo u c a n r o t a t e a v i e w b y h o l d i n g d o w n
the ALT key while you drag in a view p ort using
middle-button. This uses the current Arc Rotate
mode, w hether or not the Arc Rotate button is
active. You can also activate Arc Rotate by pressing
CTRL+R.
Usi ng Wal k t hrough N av igat ion
Walkthrough navigation lets you move through
a viewport by pressing a set of shortcut keys,
including the arrow keys, much as you can navigate
a3Dworldinmanyvideogames.
When you enter the walkthrough navigation
mode, the cursor changes to a hollow circle that
shows a directional arrow while you are pressing