8

538 Chapter 8: Modifiers
When you apply an object-space modifier, it
appears d irectly above the object with other
object-space modifiers in the
modifier stack (page
3–802)
. The order in which the modifiers appear
in the stack can affect the resulting geometry.
For a list of object-space mo difiers, see
List of
Available Modifiers (page 1–483)
.
Affect Region Modifier
Modify panel > Make a ver tex sub-object selection. >
Modifier List > Object-Space M odifiers > Affect Region
Make a vertex sub-object selection. > Modifiers m enu >
Parametric Deformers > Affect Region
The Affect Region modifier is a surfa ce modeling
tool, primarily used with vertex sub-object
selections while surface modeling. With Affect
Region, transforming a selection of vertices
can also transform vertices in the region that
surrounds the selection. This can help you form a
bubble or indentation in the surface of an object.
The easiest way to see this modifier’s effect is with a
shallow, flat box object with plenty of subdivisions.
The Affect Reg ion modifier has a two-part,
arrow-shaped gizmo plus numeric controls.
When you apply the Affec t Region modifie r, it
assigns an arrow -like gizmo consisting of two
points connected by a line. The base of the a rrow
is the start point. The length and direction of the
arrow defines the amount of movement of the
vertices. Any vertices within Falloff distance of the
base of the arrow are translated in the direction of
the arrow.
Because no points on the mesh are directly
selected, this modifier doesn’t depend on the
topology of the input object. You can apply it to
any renderable object. However, you can limit
the effect by using a selection modifier like
Mesh
Select (page 1–710)
or Volume Select (page 1–935)
to p ass a sub-object selection up the stack.
Note: T he Affect Region m odifier is ideal for simple
animated effects, especially w hen you need to use
interactive p arameters. However, for fine-tuned
modeling, you’ll probably prefer the expanded
capabilities of
Soft Selection (page 1–945) in
Editable Mesh (page 1–984) , Editable Poly (page
1–1012)
, Edit Mesh (page 1–613) , Mesh Select
(page 1–710)
, Volume Select (page 1–935) ,the
HSDS modifier (page 1–693) ,and NURBS (page
1–1091)
.
Affect Region modifier applied
Procedure
Example: To form a bubble over the surface of a
pla ne:
1.
Create a plane with 15 width and length
segments.
2. Set the length and w idth of the plane to 50 units.
3. Apply the Affect Region modifier .
4. In the Parameters group, set Falloff to 50.
5. Adjust the par ameters to achieve different
effects.
Interf ace
Note: The par ameters of this modifier are s imilar to
those of the
Soft Select ion f unc t ion (p age 1–945)
of an Editable Mesh.