If you work with 3D modeling, you know the importance of being able to import various file formats into your design software. For those using Rhino, importing MTL or OBJ files is a common task. Here's a step-by-step guide on how to do it:

1. Open Rhino: Begin by opening Rhino on your computer.

2. Select 'File': Once Rhino is open, navigate to the top menu and select 'File'.

3. Click on 'Import': From the 'File' menu, click on 'Import' to open a dialog box where you can select the MTL or OBJ file you want to import.

4. Choose the file: In the dialog box, browse your computer to find the MTL or OBJ file you want to import. Select the file and click 'Open'.

5. Adjust import settings: After selecting the file, a new dialog box may appear allowing you to adjust import settings such as units, scale, and materials. Make any necessary adjustments and click 'OK' to import the file into Rhino.

6. Review and edit: Once the file is imported, you can review and edit the 3D model as needed within Rhino.

By following these simple steps, you can easily import MTL or OBJ files into Rhino and start working with 3D models in your design projects. Whether you're a beginner or an experienced Rhino user, importing files in various formats is an essential skill for creating stunning 3D designs.