So you've got a cool 3D model in OBJ and MTL format, and you want to display it in your iOS app using Xcode. Here's how you can link OBJ MTL files in Xcode to bring your 3D model to life.

Step 1: Add the OBJ and MTL files to your Xcode project. Simply drag and drop the files into your project navigator.

Step 2: Create a new Swift file to handle the 3D model rendering. This file will contain the code to load and display the 3D model in your app.

Step 3: Write the code to load the OBJ and MTL files using the appropriate libraries. You can use libraries like SceneKit or Model I/O to achieve this. Make sure to configure the materials and textures as required.

Step 4: Set up the scene and add the 3D model to it. You can adjust the position, scale, and rotation of the model to fit your app's design.

Step 5: Build and run your app to see the 3D model in action. You may need to make adjustments to the code and model properties to get the desired result.

By following these steps, you can easily link OBJ MTL files in Xcode and display 3D models in your iOS app. This can be a great way to enhance user experience and bring a new dimension to your app's interface. Experiment with different 3D models and rendering techniques to create stunning visual effects that will impress your app users.