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Select By Channel Modifier 785
S elect B y Channel M odif ier
Select an object. > Modify panel > Modifier List > Select
By Channel
The Select By C hannel modifier works in
conjunction with the Channel Info utility (page
2–1738). After you store a vertex selection into a
subcomponent with 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,intheUsingthe Channel
Info Utility tutorial.
Procedure
To use Select B y Channel:
1.
UseChannelInfotostoreoneormorevertex
selections in a map channel subcomponent.
2. Apply the Select By Channel modifier to the
object with the stored vertex selection(s).
3. Choose the select ion type.
4. Choose the selection channel.
5. To “bake” the new selection into the object,
collapse the stack.
Inter face
Selection Type—Lets you choose how to combine
the stored vertex selection with an existing vertex
selection.
•
Replace—Replaces the existing selection with
the stored selection.
•
Add—Adds the stored selection to the existing
selection.
•
Subtract—Subtracts the stored selection from
the ex isting selection. Has no effect if there’s no
overlap b etween the stored select ion and the
existing selection.
Selection Channel—Lets you choose which 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 Modifi ers > Shell
Make a selection. > 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 original object. You can
specify offset distances for the inner and outer
surfaces, characteristics for edges, material IDs,
and mapping types for the edges.
Also, because the Shell modifier doesn’t have
sub-objects, you can use the Select options to
specify a face select ion for passing up the stack to
other modifiers. Please note that the Shell modifier
doesn’t recognize existing 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 vert ices or faces, as illustrated above. For
best results, the ori ginal polygons should face