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380 Chapter 12: Animation
Inter face
The Surface Constraint Parameters rollout is on
the Motion panel.
Current Surface Object group
This group provides a method for select ing and
then displaying the selected surface object.
Text—Displays the name of the selected object.
Pick Surf ace—Selects the object you want used as a
surface.
Surface Options group
This group provides controls for adjusting the
position and orientation of the object along the
surface.
U Position—Adjusts the position of the controlled
object along the U coordinates of the surface
object.
V Position—Adjusts the position of the controlled
object along the V coordinates of the surface
object.
No Alignment—When on, the controlled object is
not reoriented, regardless of its position on the
surface object.
Align to U—Aligns the local Z axis of the controlled
object with the surface normal of the sur face
object, and the X axis with the U axis of the surface
object.
Align to V —Aligns the local Z axis of the controlled
object with the surface normal of the sur face
object, and the X axis is aligned with the V axis of
the surface object.
Flip—Flips the alignment of the local Z axis of the
controlledobject.Thischeckboxisnotavailableif
No Alig nment is turned on.
Pa th Const r ai nt
Animation menu > Constraints > Path Constraint
Path constraint positions the service platform along the sid e
of the bridg e.
A path constraint restricts an object’s movement
along a spline or at an averaged distance between
multiple splines.
A
path target can be any type of spline. The spline
curve (target) defines a path of motion for the
constrained object. Targets can be animated using
any of the standard translat ion, rotation, scale
tools. Setting keys on the path’s sub object level,
such as vertex, or segment will animate the path
while affecting the constrained object.