9

DWG/DXF Import: Geometry Panel 543
Orient nor mals of adjacent faces
consistently —
Analyzesthefacenormalsof
each object and flips normals to make their
directions consistent. If the imported geometry
is not properly welded, or if the software can’t
determine the object’s center, normals mig ht be
oriented in the wrong direction. Use the Edit Mesh
or Normal modifiers to flip normals.
When this option is off, the software calculates
normals according to the face vertex order in the
drawing file. Face nor m als for solid objects are
already unified. Make sure this option is off when
importingdrawingscontainingsolidobjects.
You should also make sure this option is off when
working w ith AutoCAD Architecture files.
AutoCAD solids will never have their normals
unified, regardless of the setting of this import
toggle. Solids generate faces and normals correctly.
Cap closed splines—Applies an Extrude modifier
to all closed objects, and turns on t he Cap Start
and Cap End options of the modifier. The Extrude
modifier Amount value for a closed entity with no
thickness is set to 0. Capping makes closed entities
w ith thickness appear solid and closed entities
without thickness appear flat. When Cap Closed
Objects is turned off, the Extrude modifier Cap
Star t and Cap End options for closed entities w ith
thickness are turned off. No modifiers are applied
to closed entities without thickness, except for
Circle, Tr ace, and Solid.
Note: If Use Extrude Modifier to Represent Thickness
is off, the software does not apply an Extrude
modifier to closed objects.
Texture mapping—The texture mapping sett ings
affect the loading time of models that have many
objects with stored UVW Coordinates for texture
mapped materials.
Note: This sett ing only applies to geometry that
is stored as a mesh in the scene. Spline shapes
marked as renderable hav e separate controls
for UVW coordinate genera tion on the Spline
Rendering panel.
•
No mapping coordinat es—When No Mapping
Coordinatesisused,thesoftwarenotgenerate
texture coordinates for the mesh objects that
are imported.
When drawings are imported, objects are
addedtothesceneasEditableMeshobjects
that do not have UV W coordinate assignments.
Before assig ning materials to imported objects,
you’ll need to apply a UVW Map modifier (page
1–922) 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 v iewport is
set to Smooth + Highlights. If the UVW Map
modifier is not applied, the objec t turns gray
and you’ll see a Missing Map Coordinates dialog
(page 2–1623) 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
coordinates generated w hen the drawing is
imported.
This option tells the DWG/DXF Importer to
create UVW coordinates, but loading time
is increased while the co ordinate gener ation
occurs.
Curve steps—Adjusts how smoothly an arc or c urve
appears when the drawing is imported. Larger
numbers result in smoother curves. Default=10.
Maximum sur face deviation for 3D solids—Specifies
themaximumallowabledistancefromthe3dsMax
surface mesh to the parametric 3D solid surface.
Small numbers produce more accurate surfaces
with a greater number of faces. Large numbers
produce less accurate surfaces with fewer faces. In
most cases, the default value suffices. Default=1.0.