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Arc Rotate, Arc Rotate Selected, Arc Rotate Sub-Object 787
Arc Rotate, Arc Rotate Selected,
Arc Rotate Sub-Object
Activate a Perspective or Or thog raphic viewport. >
Viewport Navigation controls > Arc Rotate flyout
Keyboard > ALT+middle mous e button
The Arc Rotate buttons, on the
Arc Rotate flyout
(page 3–786)
, spin the viewpoint freely around a
center.
Three Arc Rotate variants are available: Arc Rotate,
Arc Rotate Selected, and Arc Rotate Sub-Object.
Arc Rotate is
modal (page 3–1067)
:itremains
active until you right-click or choose another
command.
Arc Rotate respects
Angle Snap (page 2–36)
.
If you turn on Angle Snap, the Arc Rotate mouse
pointer displays a magnet, and the rotation snaps
by the
View port Arc Rotate Snap Ang le sett ing
.
ArcRotationusedahidden“virtualtarget”as
the point which is used for the center of rotation.
HoldingtheCTRLkeydowninArcRotate
mode has a special behavior: It does a rotation
of the scene around the screen’s X and Y axis
(at the position of the virtual target). Move the
mouse horizontally yields rotation around
world
coordinates referential Z-axis. User moves the
mouse vertically yields rotation around screen
coordinates referential X-axis. This differs from
standard Arc Rotate, when horizontal mouse
movement rotates around
screen
coordinates
referential Y-axis.
Pr ocedur es
To use Arc Rotate:
1.
Activate a Perspective or Orthographic
viewport.
2. ClickanyofthethreeArcRotatebuttons.
A view rotation “trackball” is displayed as
ayellowcirclewithhandlesplacedatthe
quadrant points.
3. Drag the mouse on and around the trackball to
produce different types of view rotations. The
cursorchangestoindicatewhattypeofrotation
you are about to perform.
• Drag the handles to keep the rotation either
horizontal or vertical. Drag horizontally on
thesidehandles,orverticallyonthetopor
bottom handle.
• Draginsidethetrackballtorotatetheview
freely within the viewport. The f ree rotation
continues whi le dragg ing even if the cursor
crosses outside the trackball.
• Drag outside the trackball to rotate the view
about the depth axis that is perpendicular
to the screen. When the cursor crosses
inside the trackball during dragging, free
rotation occurs. When the cursor crosses
back outside the tra ckba ll, spinning rotation
is again in effect.
4. Press ESC or right-click to end Arc Rotate.
To constrain rotation to a single ax is:
•HolddowntheSHIFTkeyasyourotate.
Therotationisconstrainedtothefirstaxisyou
use.
To rotate with k eyboard a nd mouse:
•HolddowntheSHIFTkeyasyourotate.
Therotationisconstrainedtothefirstaxisyou
use.
Interfa ce
Arc R otate—Uses the view center as the center
of rotation. If objects are near the edges of the
view por t, they may rotate out of view.