File menu > Export > Wavefront Object (*.OBJ)
The ASCII-based OBJ format makes it possible to exchange graphical data between many applications. Both polygons and freeform geometries such as curves are supported with these format. You can export Autodesk VIZ files to this format.
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If you choose to group by object, then the exported information will be organized by object. This information will be available when you import the file so that you can choose certain objects to import rather than the entire file.
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If you select to group by material, then the exported information will be organized by materials. When importing, you can select to only important elements that are associated with a particular material.
Group by—Lets you group the information in the OBJ file by object, material, or by using defaults. The choice you make will be important when you want to import the file. For example, it may be useful to group by material if you have several objects that use the same material.
Use materials—Determines whether the materials that are associated with the object are also exported to the OBJ file.
Create material library—Determines whether a separate library is created to store the information about the materials. This creates a MTL library in the same directory as the OBJ file, first prompting for information with the MTL Export dialog.
Rotate model—Exports the geometry to match its orientation in Autodesk VIZ.
Faces—Choose whether the mesh faces are stored as triangles, quadrangles, or polygons.
Texture coordinates—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.
Normals—When on, the normal information for the mesh is stored.
Smooth groups—When on, the information about color transition between groups is stored. See Viewing and Changing Smoothing.
Vertex 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.
# of Digits—The precision of the exported vertex data, as expressed by the number of decimal places.
Compress numbers—When on, trailing zeroes are eliminated from decimal fractions. This makes the exported file smaller without sacrificing any 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.