8

Shell Modifier 779
If you don’t specify a material ID, the surface uses
thesamematerialIDorIDsastheoriginalfaces
from which the edges are derived.
Edge M at ID—Specifies the material ID for edge
faces. Available only when Override Edge MatID
is on.
Auto S mooth Edge—Applies automatic,
angle-based smoothing across the edge faces using
the Angle parameter. When off, no smoothing is
applied. Default=on.
This doesn’t apply smoothing across the junction
between the edge faces and the outer/inner sur face
faces.
Angle—Specifies the maximum ang le b etween
edge faces that will be smoothed by Auto Smooth
Edge. Available only when Auto Smooth Edge is
on. Default=45.0.
Faces that m eet at an angle greater than this value
will not be smoothed.
Override Smooth Group—Lets you specify a
smoothing g roup (page 3–1107) for the new edge
polygons using the Smooth Grp setting. Available
only when Auto Smo oth E dge 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 value of
0, no smoothing group is assigned to the edge
polygons. To specify a smoothing group, change
the value to a number b etween 1 and 32.
Note: When A uto Smooth Edge and Override
Smooth Group are both off, the software assigns
smoothing group 31 to the edge polygons.
Edge M appi ng—Specifies the type of texture
mappingthatisappliedtothenewedges.Choose
a mapping type from the drop-down list:
•
Co py—Each edge face uses the same UVW
coordinates as the original face from which it’s
derived.
•
None—Each edge face is assigned a U va lue of 0
and a V value of 1. Thus, if a map is assig ned,
the edges w il l 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 straight-line edges.
If you apply Shell to a subdivided object with
straight edges, such as a b ox set to 3x3x3 seg m ents,
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.