If you're working with 3D modeling and design, you may find yourself needing to export OBJ files from Revit. This process can be a bit tricky, but with the right steps, you can easily export your Revit models into OBJ format for use in other 3D modeling applications. Here's a step-by-step guide to help you through the process:

1. Prepare your Revit model: Before you can export your model to OBJ format, it's important to ensure that your Revit model is properly set up. Make sure your model is complete and that all necessary textures and materials are applied.

2. Open the 3D view: In Revit, navigate to the 3D view that you want to export. This is the view that will be used to generate the OBJ file. If you need to make any final adjustments to the view, do so at this time.

3. Export to DWG format: Revit does not have a built-in option to export directly to OBJ format. Instead, you'll need to first export your 3D view to a DWG file. To do this, go to the 'File' menu, select 'Export', and then choose 'CAD Formats (.dwg)'.

4. Use third-party software: Once you have exported your 3D view to a DWG file, you'll need to use third-party software to convert the DWG file to OBJ format. There are several software options available for this conversion, including free online converters and dedicated 3D modeling software.

5. Import the OBJ file: After converting the DWG file to OBJ format, you can then import the OBJ file into your desired 3D modeling application. This will allow you to work with your Revit model in other software and continue your 3D design process.

By following these steps, you can successfully export your Revit models to OBJ format and use them in a variety of 3D modeling applications. Keep in mind that the exact steps may vary slightly depending on the specific versions of Revit and third-party software that you are using, but the general process should remain the same. With a little practice, you'll be able to seamlessly integrate your Revit models into your 3D design workflow.