9

Attribute Holder Modifier 559
Curve group
Pinch—Affects the tangency of the curve where
it meets the arrow tip. P ositive values produce
a pointed tip while negative values produce a
dimple. (Spinner value range: float, -999,999.0 to
999,999.0)
B ubble—Changes the curvature of the affected
vertices. A va lue of 1.0 produces a half-dome. As
you reduce this value, the sides of the dome slope
more steeply. Negative values lower the base of the
curvebelowthebaseofthearrowgizmo.(Spinner
value range: float, -999,999.0 to 999,999.0)
Attribute Holder M odifier
Create or select an object. > Modify panel > Modifier List
> Object– Space Modifiers > Attribute Ho lder
Create or select a n object > Modifiers menu > Animation
> Attribute Holder
The Attr ibute Holder mo difier is an empt y
modifier that provides a readily accessible user
interface on the Modify panel to which you can
add custom attributes (page 1–129).Ithasnouser
interface of its own; the interface consists solely
of those attributes you assign to it. In essence,
Attribute Holder is a str ipped-down version of
Parameter Collector (page 1–138) that can collect
only custom attributes and appears on the Modify
panel instead of a floating dialog.
Procedure
Example: To collect different custom a ttributes in an
Attribute H older modifier:
Before undertaking this procedure, you should be
familiar with basic usage of the Par ameter Wiring
dialog (page 2–412).
1. Add a smal l box to an empty scene. Make it
about 20.0 units on a side.
2. Apply a Taper modifier and an Attribute Holder
modifier, in that order.
In the modifier stack, the Attribute Holder
modifier should be highlighted.
3. From the Animation menu, choose Parameter
Editor.
4. In Parameter Editor, on the Attribute Rollout,
make or ensure the following settings:
• Add to Ty pe=Selected Object’s Current
Modifier
• Parameter Ty pe=Float
•UIType=Slider
•Name=Box Height
5. On the Float UI Options rollout, keep all the
default settings.
6. On the Attribute Rollout, click Add.
The Custom Attributes rollout appears on the
Modif y panel, containing the new Box Height
slider.
7. Add another attribute:
• Add to Ty pe=Selected Object’s Current
Modifier
• Parameter Type=Integer
•UIType=Spinner
•Name=Box Height Segs
• Integer UI Options > Range=From 1 to 50.
8. Add two more Float/Spinner attributes named
Ta p e r A m ount and Ta p er Cu r ve.
The Attribute Holder modifier now has four
custom attr ibutes, but they don’t do a nything
because they’re not connected. You’ll use
Parameter Wiring to ho ok them up.
9. Close the Parameter Editor dialog.
10. In the active view port, right-click the box and
choose Wire Parameters. From the pop-up
menu that appears, choose Modified Object >
Box (Object) > Height.