9

868 Chapter 8: Modifiers
Operation group
Specifies the type of operation that’s performed on
the selected spline.
Auto—When this is chosen, a Trim is first looked
for and, if not found, an Extend is attempted. In
most cases, a Tr im will o ccur when Auto is chosen.
An Extend c an occur, however, in cases where
an open spline exists without intersecting other
splines.
Trim Only—Performs only trims. Turn on Pick
Locations, and then click the spline section you
want to trim.
Extend Only—Performs only extends. Click Pick
Locations, and then select the open spline se ction
you want to extend.
Infinite B oundaries—For the purposes of
calculating intersections, turn this on to treat open
splines as infinite in length. For example, this lets
you trim one linear spline against the extended
length of another line that it doesn’t actually
intersect.
Note: As the number of open splines in the shape
increases, the chance of finding an intersection,
when using Infinite Boundaries , increases as well.
This can produce results you might not have
expected because of projected spline intersections
yo u hadn’t considered, particularly if you’re in
Auto mo de. For predictable results, avoid using
Auto mode w hen using Infinite B oundaries.
Intersection Projection group
These options specify how the Trim and Extend
functions determine a valid intersection.
View—Projectsthelinesontotheactiveviewport,
andjudgestheintersectionsaccordingly. These
are the intersections as you see them in the active
viewport.
Construction Pla ne—Projects the lines onto the
current construction plane.
None (3D)— Considers only tr ue intersections as
the splines exist in 3D space. They must physically
intersect to be considered.
Tur boS mooth M odif ier
Make a selection. > Modify panel > Modifier List >
Object-Space Modifiers > TurboSmooth
The TurboSmooth modifier, like MeshSmooth
(page 1–722), smo othes geometry in your scene.
The differences between the two are as follows:
•TurboSmoothisconsiderablyfasterand
more memory-efficient than MeshSmooth.
TurboSmooth also has an option for Explicit
Normals, unavailable in MeshSmooth. See
Explicit Normals.
• TurboSmooth provides a limited subset of
MeshSmooth functionality. In particular ,
TurboSmooth uses a single smoothing method
(NURMS), can be applied only to an entire
object, has no sub-object levels, and outputs a
triangle-mesh object.
TurboSmooth lets you subdivide the geometry
whileinterpolatingtheanglesofnewfacesat
corners and edges, and apply a single smo othing
group to all faces in the object. T he effect of
TurboSmooth is to round over corners and edges
asiftheyhadbeenfiledorplanedsmooth.Use
TurboSmooth parameters to control the size and
number of new faces, and how they affect the
surface of the object.