If you are a game developer using Roblox Studio and looking to add more 3D models to your projects, you may want to import OBJ files into Roblox Studio. Although Roblox Studio primarily supports its own file format (.rbxm), you can still import OBJ files with the help of a third-party plugin.

To start, you will need to download the 'OBJ Importer' plugin from the Roblox library. Once you have the plugin installed, follow these steps to open OBJ files in Roblox Studio:

Step 1: Launch Roblox Studio and open the place where you want to import the OBJ file.

Step 2: Click on the 'View' tab at the top of the Studio window, and then select 'Explorer' to open the Explorer panel.

Step 3: In the Explorer panel, right-click on the 'StarterPack' or any other location where you want to import the OBJ file, and then select 'Insert Object'.

Step 4: In the dialog box that appears, type 'OBJ Importer' and press Enter to search for the plugin.

Step 5: Double-click on the 'OBJ Importer' plugin from the search results to insert it into your place.

Step 6: With the 'OBJ Importer' plugin selected in the Explorer panel, click on the 'Properties' tab at the top of the Studio window to view the plugin's properties.

Step 7: In the properties panel, you will find a property called 'OBJ File' where you can input the file path of the OBJ file you want to import. Click on the three dots (...) next to the 'OBJ File' property to browse and select the OBJ file from your computer.

Step 8: Once you have selected the OBJ file, the plugin will automatically import and convert the 3D model into a format that Roblox Studio can understand.

Step 9: You can now position, scale, and manipulate the imported OBJ file just like any other Roblox model within your game project.

By following these steps, you can bring a variety of 3D models and objects into Roblox Studio to enhance the visual quality and interactivity of your games. Keep in mind that the performance of your game may be affected by the complexity of the imported OBJ files, so it's important to optimize them for your specific game environment.

Now that you know how to open OBJ files in Roblox Studio, start experimenting with different 3D models and unleash your creativity in game development!