9

Shell Modifier 789
If you don’t specify a material ID, the surface uses
thesamematerialIDorIDsastheoriginalfaces
from which the edges are derived.
Edge Ma t ID—Specifies the materia l ID for edge
faces. Available only when Override Edge MatID
is on.
Auto Smoot h Edge—Applies automatic,
angle-based smo othing across the edge faces using
the Angle para meter. When off, no smoothing is
applied. Default=on.
This do esn’t apply smoothing across the junction
between the edge faces and the oute r/inner surface
faces.
Angle—Specifies the maximum angle between
edge faces that will be smoothed by Auto Smooth
Edge. Available only when Auto Smooth Edge is
on. Default=45.0.
Faces that meet at an angle greater than this value
will not be smoothed.
Override Smooth Group—Lets you specify a
smoothing group (page 3–1013) for the new edge
polygons using the Smooth Grp setting. Available
only when Auto Smooth E d ge is off. Default=off.
Smooth Gr p—Sets the smoothing group for the
edge polygons. Available only when Override
Smooth Group is on. Default=0.
When Smooth Grp is set to the default va lue of
0, no s mo othing group is assi gned to the edge
polygons. To specif y a smoothing group, change
the va lue to a number between 1 and 32.
Note: When Auto Smooth Edge and Override
Smooth Group are both off, the software assigns
smoothing group 31 to the e dge polygons.
Edge Ma pping—Specifies the type of texture
mappingthatisappliedtothenewedges.Choose
a mapping type from the drop-down list:
•
Co py—E ach e dge face uses the same UVW
coordinates as the original face from which it’s
derived.
•
None—Each edge face is assigned a U value of 0
and a V value of 1. Thus, if a map is assigned,
the edges will take the color of the upper-left
pixel.
•
Strip—Theedgesaremappedinacontinuous
strip.
•
Interpolate—Theedgemappingisinterpolated
from the mapping of the adjacent inner and
outer surface polygons.
TV Offset—Determinesthespacingofthetexture
vertices across the edges. Available only with
the Edge Mapping choices Strip and Interpolate.
Default=0.05.
Increasing this value increases the repetition of the
texturemapacrosstheedgepolygons.
Select Edges—Selects the edge faces. This
selection is passed up the stack to other modifiers.
Default=off.
Select Inner Faces—Selects the inner faces. This
selection is passed up the stack to other modifiers.
Default=off.
Select Outer Faces—Selects the outer faces. This
selection is passed up the stack to other modifiers.
Default=off.
Straighten Corners—Adjusts corner vertices to
maintain straig ht-line edges.
If you apply Shell to a subdivided object with
straight edges, such as a box set to 3 x3x3 segments,
you might find that the corner vertices don’t stay
in a straight line with the other edge vertices. This
givestheedgesabulginglook.Toresolvethis,turn
on Straighten Corners.