8

Select By Channel Modif ier 775
S elect B y Channel M odif ier
Select an objec t. > M o dify panel > Mod ifier List > Select
By Channel
The Select By Channel modifier works in
conjunction with the
Channel Info utility (page
2–1549)
. After you store a vertex selection into a
subcomponent w ith Channel Info, use Select By
Channel to quickly access the selection.
You can find an advanced example of using Select
By Channel in a
lesson about allowing objects to
survive topology changes,intheUsing the Channel
Info Utility tutorial.
Procedure
To use S elect B y Channel:
1.
UseChannelInfotostoreoneormorevertex
selections in a map channel subcomponent.
2. Apply the S elect By Channel modifier to the
object with the stored vertex selection(s).
3. Choose the selection type.
4. Choose the select ion channel.
5. To “bake the new selection into the object,
collapse the stack.
Inter face
Selection TypeLets you choose how to combine
the stored vertex selection with an existing vertex
selection.
Replace—Replaces the existing selection with
the stored select ion.
Add—Adds the stored selection to the existing
selection.
SubtractSubtracts the stored selection f rom
the existi ng selection. Has no effect if there’s no
overlap between the stored selection and the
existing selection.
Selection Channel—Lets you choose w hich stored,
named vertex-selection channel to apply to the
modified object. Click the arrow to the right of the
name field to open the drop-down list, and then
click a channel in the list.
Shell Modifier
Modify panel > Make a selection. > Modifier List >
Object-Space Modifiers > Shell
Make a selec tion. > Modifiers menu > Parametric
Deformers > Shell
The Shell modifier “solidifies” or gives thickness
to an object by adding an extra set of faces facing
the opposite direction of existing faces, plus edges
connecting the inner and outer surfaces wherever
faces are missing in the origi nal object. You can
specify offset distances for the inner and outer
surfaces, characterist ics for edges, material IDs,
and mapping ty pes for the edges.
Also, because the Shell modifier doesn’t have
sub-objects, you can use the
Select options
to
specify a face selection for passing up the stack to
other modifiers. Please note that the Shell modifier
doesn’t recognize exist ing sub-object selections,
nordoesitpasssuchselectionsupthestack.
Left: Sphere with part of surface removed; Right: Sphere
with Shell applied
You’d typically use Shell on an object with part of
its surface removed, such as a sphere with several
deleted vertices or faces, as illustrated above. For
best results, the original polygons should face