Rhino lets you create 3D models using built-in or custom tools, and allows you to import files from other 3D animation and modeling programs. It supports WaveFront OBJ files that describe an object's 3D geometry, including the location of each vertex and the face of the shapes used in a design. After you import the OBJ file into Rhino, you can view the 3D model, make any needed changes and save the file in one of Rhino's many supported formats.
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Launch Rhino. Click the "File" menu and select "Open" to use an existing project or "New" to start a new project.
Click Rhino's "File" menu again and select the "Import" option. Click the "Files of Type" drop-down menu, then select "WaveFront OBJ (*.obj)." Locate the OBJ file in the dialog box and click "Open" to import the OBJ into your Rhino project.
Make any desired changes to your project. Click "File" and select "Save" to save your updated project. Type a project name, then select a file type from the "Save As Type" drop-down list. Select "Rhino 4 3D Models (*.3dm)" as the file type if you want to use Rhino's own modeling format. Click "Save" to save the updated project.