If you're a 3D modeler using Source Filmmaker (SFM), you may want to import OBJ files into the program for your projects. Here are the steps to do so:

1. Prepare Your OBJ File: Make sure your OBJ file is properly exported from your 3D modeling software. Ensure that the texture file is included and that the file structure is correct.

2. Open Source Filmmaker: Launch SFM and create a new project or open an existing one where you want to import the OBJ file.

3. Import the OBJ File: In SFM, go to the 'File' menu and select 'Import' > 'Model'. Navigate to the location of your OBJ file and select it. Click 'Open' to import the file into your project.

4. Position and Scale the Model: Once the OBJ file is imported, you may need to position and scale it to fit your scene. Use the manipulator tools in SFM to move and resize the model as needed.

5. Apply Textures (If Necessary): If your OBJ file includes textures, you may need to apply them to the model in SFM. Use the material editor in SFM to assign textures to the model surfaces.

6. Save Your Project: After importing and adjusting the OBJ file, make sure to save your SFM project to retain the changes and continue working on your scene.

By following these steps, you can easily import OBJ files into Source Filmmaker for your 3D modeling projects. Whether you're creating animations, machinima, or still renders, importing OBJ files can greatly expand your creative possibilities in SFM.