9

762 Chapter 8: Modifiers
End Frame—
The frame number at which the
cached animation starts playing back. Using
decimal fractions lets you start at a sub-frame
setting when using a Frame:Ticks time display.
Avai lable only w hen Playback Type is set to
Custom Range. Default=0.0.
Fr ame—Lets you anim ate playback of the cache;
for details, see Playback Graph, above.
Clamp Gr aph —Controls what gets loaded when
thePlaybackGraphframeisoutoftheoriginal
recorded range.
Take an example in which the playback frame is set
to 105, but the original cache w as recorded over
frames 0-100. With Clamp Graph on, t he loaded
frame will be 100. If it’s off (the default), the cache
will"wraparound"andloadframe5.
This lets you lo op caches more easily. In the
aboveexample,youcouldsimplyhaveatwo-key
playbackgraph.Thefirstkeywouldbeatframe
0withavalueof0.0,andthesecondwouldbe
at frame 100 with a value of 100.0. You would
then set the out-of-range t y pe (page 2–551) for the
Frame p arameter (Playback Frame in Tr ack View)
to Linear, and the cache would loop back smoothly
to the beginning at frame 101.
Poly Select Modifi er
Make a selection. > Modify panel > Modifier List > Poly
Select
Make a selection. > Mod ifiers menu > Selection M odifiers
> Poly Select
The Poly Select modifier lets you pass a sub-object
selection up the st ack to subsequent modifiers.
It provides a superset of the selection fun ctions
available in Editable Poly (page 1–1022).Youcan
selectvertices,edges,borders,polygons,and
elements. You can change the selection from
sub-object level to object level.
When you apply the Poly Select modifier
and then go to any sub-object level, the
select-a nd-transform buttons in the toolbar
are unavailable, and the Select Object button is
automatically activated.
Using XForm M odif ier s to A nimate a Poly
Selection
When you apply a Poly Select modifier, there
are no animation controllers assigned to the
sub-object selection. This means that the selec tion
has no way to "carry" the transform information
needed for animation.
To animate a sub-object selection using Poly
Select, apply either an XForm or Linked XForm
modifier to the selec tion. These modifiers provide
the necessary controllers for animating the effects
of transforms. In a sense, they give "whole-object
status" to the sub-object selec tion.
• XForm (page 1–959)
Animates transforms directly on a sub-object
selection. Creates a gizmo and center for the
sub-object select ion. You can animate both,
with the center acting as a pivot point for the
selection.
• Linked XForm (page 1–712)
Lets you choose another object to control the
animation. The sub-object selection is linked to
the "control object." When you t ransform t he
control object, the sub-object selection follows
accordingly.
Procedure
To use the Poly S elect modifier:
1.
Create or select an object.
Note: Applying a Poly Select modifier to an
object other than a polymesh type will convert
the object to a p olymesh object. If you want
more control over the conversion, add a Tur n
To Poly modifier (page 1–874) before apply ing