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638 Chapter 20: Managing Scenes and Projects
Inter face
Group and Material group
Group by—Lets you group the information in the
OBJfilebyobject,material,orbyusingdefaults.
Thechoiceyoumakewillbeimportantwhenyou
want to import the file. For example, it may be
useful to group by material if you have several
objectsthatusethesamematerial.
Use materials—Determines whether the materials
that are associated w ith the object are also
exported to the OBJ file.
Create mater ia l li bra r y —Determines whether a
separate library is created to store the information
about the materials. This creates a MTL library in
thesamedirectoryastheOBJfile,firstprompting
for information with the
MTL Export dialog (page
3–639)
.
Geometr y group
Rotate model—Exports the geometry to match its
orientation in 3ds Max.
Faces—Cho ose whether the mesh faces are stored
as triangles, quadrangles, or polygons.
Tex tu re coordinat es—When on, the texture
coordinates are stored with the exported file.
When you import the file in another application
you will be able to use this information if it is
supported.
Nor mals —When on, the normal information (page
3–1074)
for the mesh is stored.
Smooth groups—When on, the information about
color transition between groups is stored. See
View ing and Changing Smoothing (page 1–162) .
Ver tex scale—Determines the scaling for the
contents of the OBJ file. The default value of 1.0
means the exported file will have the same scaling
as the source file.
File group
# of Digits—The precision of the exported vertex
data, as expressed by the number of decimal places.
Compress number s—When on, trailing zeroes are
eliminated from decimal fractions. This makes
theexportedfilesmallerwithoutsacrificingany
precision, but can cause compatibility issues when
importing with certain programs. If you’re unable
to import an OBJ file, make sure this option is off
and export again.
Relative vertex numbers—Causes face vertex
indices in exported files to be expressed as
relative (i.e., negative) numbers. This can cause
compatibility issues when importing with certain
programs. If you’re unable to import an OBJ file,
make sure this option is off and export again.
Can cel—Cancels the OBJ export.