Do you want to import a .mtl or .obj file into Rhino for your 3D modeling project? Look no further, because we've got you covered with this simple guide.

Here's how you can easily import a MTL or OBJ file into Rhino:

1. Open Rhino: First, open Rhino on your computer to get started.

2. Go to File: Once Rhino is open, go to the 'File' menu at the top of the screen.

3. Select Import: From the 'File' menu, select the 'Import' option.

4. Choose File Type: In the dialog box that appears, choose the file type as .mtl or .obj, depending on the file you want to import.

5. Locate the File: After choosing the file type, browse and locate the .mtl or .obj file you want to import into Rhino.

6. Open the File: Once you've located the file, click 'Open' to import it into Rhino.

7. Adjust Settings: Depending on the file, you may need to adjust some settings such as scale and orientation to ensure the imported object appears correctly in your Rhino workspace.

8. Done: That's it! You've successfully imported a .mtl or .obj file into Rhino.

By following these easy steps, you can seamlessly incorporate .mtl or .obj files into your Rhino projects without any hassle. Now you can use these imported files as part of your 3D modeling and design work in Rhino.

So, the next time you have a .mtl or .obj file that you want to work with in Rhino, just follow these steps and you'll be all set. Happy modeling!