Importing OBJ files with textures into Unreal Engine can be a crucial step in creating immersive 3D environments. Here's a step-by-step guide to help you achieve this seamlessly.

1. Prepare your OBJ file: Ensure that your OBJ file is accompanied by its respective texture files, which are typically in formats such as PNG or JPG.

2. Import OBJ into Unreal Engine: Open Unreal Engine and navigate to the content browser. Right-click on the location where you want to import the OBJ file and select 'Import'.

3. Locate your OBJ file: Browse your file system and select the OBJ file you wish to import. Once selected, click 'Open' to proceed.

4. Set import options: A dialogue box will appear with import options. Ensure that the 'Import Textures' option is checked to import the associated textures along with the OBJ file.

5. Adjust material settings: Once the import is complete, navigate to the imported OBJ file in the content browser. Right-click on the file and select 'Create Material'.

6. Connect textures to material: In the Material Editor, import the associated texture files by dragging and dropping them into the editor. Connect the texture nodes to the appropriate material properties, such as base color, roughness, and metallic.

7. Apply the material to the object: Drag the created material from the content browser onto the imported OBJ file to apply the textures to the object.

8. Fine-tune material properties: You can further refine the appearance of the object by adjusting the material properties in the Material Editor. Experiment with settings like tiling, UV mapping, and shader parameters to achieve the desired look.

9. Test in the scene: Drag and drop the textured object from the content browser into your level to see how it looks in the environment. Make any additional tweaks as needed to achieve the desired visual result.

10. Save and package: Once satisfied with the imported OBJ and its textures, ensure to save your work and package your project to maintain the integrity of the imported assets.

By following these steps, you can effectively import OBJ files into Unreal Engine while preserving their associated textures for a captivating 3D modeling experience. Whether you're creating architectural visualizations, game environments, or interactive simulations, mastering this process is essential for bringing your 3D projects to life within Unreal Engine.