9

Prismatic Constraint 755
3.
A ccess the sub-object level corresponding to
the object whose attachment point you want
to move: Child Space or Parent Space. If
the constraint is single-bodied, Parent Space
represents the world attachment position and
rota tion of the constraint axes.
4. The space, represented by a p air of axes, the
larger of which represents the sliding axis,
becomes act ive in the viewpor t and can b e
moved or rotated using the Move or Rotate tool,
respectively. The space maintains its position
and rotation relative to its corresponding
object. For example, if you move or rotate the
child bo dy, Child Space moves with it.
5. To realign the constraint space to the child
body, reattach the object to the Prismatic
constraint, or choose the Align To Child Body
option.
To limit the movement of the child body a long the
sliding ax is:
1.
With the constraint selected, open the
Properties rollout.
2. Turn on the Limited check box.
Both Limit parameters (Min and Max) are
set by default to 0.0. This means t hat f rom a
situation where the sub-objects are fully aligned
for the objects, the child can move 0 units in
either direction along the shared sliding axis
relative to the parent.
ThelimitsaredisplayedasalineinParent
Space.
3. Change the Min Limit and Max Limit s ettings
as necessary.
Interfa ce
Modifier Stack
Parent S p a ce—At t his sub-object level, you can
move and rotate the representation of the Prismatic
constraint for the parent body. The constraint
axes are defined in the parent b ody’s space, which
means that if you alter the position or rotation of
the parent, the space moves as well and maintains
its offset rotation and translation with respect to
the parent. When you assign a parent body to
the constraint, Parent Space is also aligned with
the child body’s local space, with the constraint
axis going through the child body’s pivot point. If
the constraint is single-bodied, then Parent Space
represents the world orientation and position of
the constraint.
Child Space—At this sub-object level, you can move
and rotate the representation of the Prismatic
constraint for the child body. The constraint