When working on game development projects in Unity, it is often necessary to collaborate with other team members or use external tools that require interoperability with OBJ format. Luckily, Unity provides a convenient way to convert selected gameobjects to OBJ, allowing you to efficiently work with this popular 3D model format. Here's how you can do it:

1. Select the Gameobjects: First, select the gameobjects that you want to convert to OBJ format. You can do this by clicking on the desired gameobjects in the scene view or hierarchy view.

2. Export as OBJ: With the gameobjects selected, go to the Unity menu and navigate to Assets > Export Package. This will open a dialog box where you can choose the gameobjects to include in the package. Ensure that the selected gameobjects are checked and click on the 'Export' button.

3. Set Export Options: After clicking the 'Export' button, another dialog box will appear where you can set the export options for the selected gameobjects. Choose 'OBJ' from the format drop-down menu and specify the file name and destination for the exported OBJ file.

4. Convert and Save: Once you have set the export options, click on the 'Export' button to convert the selected gameobjects to OBJ format. Unity will then process the conversion and save the OBJ file to the specified destination.

By following these simple steps, you can easily convert selected gameobjects to OBJ format in Unity, making it easier to collaborate with team members or integrate your game project with external tools that support OBJ format. This capability enhances the interoperability and flexibility of your game development workflow, allowing you to leverage the strengths of different tools and technologies for a more efficient and productive development process.