8

Importin g DXF Files 549
• Dependi ng on the Texture Mapping option
you choose, UVW coordinates are translated
correctly.
Weld —Sets whether coincident vertices of
conv erted objects are welded according the to
Weld Threshold setting. Welding smoothes
across seams and unifies normals of objects with
coincident vertices. To use the Weld option,
firstturnonConvertToSingleObjects,because
weldingoccursonlyforverticesthatarepartof
thesameobject.
Weld Thresho ld —Sets the distance that determines
whether v ertices are coincident. If the distance
between two vert ices is less than or equal to the
Weld Threshold, the vertices are welded together.
Auto-smooth—Assigns smoothing groups
according to the Smooth Angle value. Smoothing
groups determine whether faces on an object
render as a smooth surface or display a seam at
their edges, creating a faceted appearance.
Smooth Angle—Controls whether smoothing
occurs between two adjacent faces. If the angle
betweenthetwofacenormalsislessthanorequal
to the smooth angle, the faces are smoothed.
Unif y Nor mals —Analyzesthefacenormalsofeach
object and flips normals where necessary, so they
all point out from the center of an object. If the
imported geometry is not properly welded, or if
the software can’t determine the object’s center,
normals might be oriented in the wrong direction.
Use the Edit Mesh or Normal modifiers to flip
normals.
When Unify Normals is turned off, normals are
calculated according to the face vertex order in the
DXF file. For instance, face normals for AutoCAD
ACIS solids are a lready unified. Turn off Unify
Normals when importing ACIS solid models from
AutoCAD.
Cap Closed Entities—Applies an extrude modifier
to all closed entities, and turns on the Cap Start
and Cap End options of the modifier. The E xtrude
modifier Amount va lue for a closed entity with no
thickness is set to 0. Capping makes closed entities
with thickness appear solid a nd closed entities
without thickness appear flat. When Cap Closed
Entities is turned off, the Extrude modifier Cap
Start and Cap End options for closed entities with
thickness are turned off. No mo difiers are applied
to closed entities without thickness, except for
Circle,Trace,andSolid.
Texture Mapping—The texture mapping
settings affect the lo ading time of models that have
many objects with stored UVW Coordinates for
texture mapped materials.
Note: This setting only applies to geometry that
is stored as a mesh in the scene. Spline shapes
marked as renderable have separate controls
for UVW coordinate generation on the Spline
Rendering panel.
•
No Ma pping Coordinates—When No
Mapping Coordinates is used, the File Link
Manager will not generate texture coordinates
for the mesh objects that are linked.
When DXF files are imported, objects are
addedtothesceneasEditableMeshobjects
that do not have UVW coordinate assignments.
Before assig ning materials to imported objects,
you’ll need to apply a
UVW Map mo difier
(page 1–905)
to add texture coordinates. When
you then apply the material and the material or
texture map is set to Show Map in Viewport,
the texture map is displayed if the viewport
is set to Smooth + Hig hlights. If the UVW
Map modifier is not applied, the object turns
gray and you’ll see a
Missing Map Coordinates
dialog (page 2–1433)
when you render the
scene.
This option gives you faster loading speed, but
no UVW coordinate generation.
•
Gener ate Coordinates For A ll Obj ects—This
option forces all objects to have UVW