Houdini is a powerful 3D animation and visual effects software that allows users to create stunning visual designs and animations. When working with 3D models in Houdini, you may want to export your creations as OBJ files for use in other programs or to share with others. Here's how you can easily export Houdini as OBJ.

1. Select the 3D Model: First, open your Houdini project and select the 3D model or models that you want to export as OBJ. Make sure the models are ready for export and positioned as desired.

2. Go to File: Once your 3D models are selected, navigate to the 'File' menu at the top of the Houdini interface. Click on 'File' to reveal the dropdown menu.

3. Choose Export: In the 'File' menu, look for the 'Export' option and hover over it to reveal additional export options. From the dropdown menu, select 'Export OBJ'.

4. Specify Export Settings: After selecting 'Export OBJ', a window will appear with options for specifying your export settings. You can choose the file destination, scale, and other settings for the OBJ export.

5. Save the OBJ File: Once you've specified your export settings, click 'Save' to export your Houdini 3D model as an OBJ file. Choose a file name and location for the export, then click 'Save' to complete the export process.

6. Verify the Export: After saving the OBJ file, navigate to the file location on your computer to verify that the export was successful. You can also open the OBJ file in other 3D modeling or rendering programs to ensure that the export retained the model's details.

By following these steps, you can easily export your Houdini 3D models as OBJ files for use in other programs or sharing with others. Whether you're collaborating with other designers or integrating your Houdini creations into different 3D workflows, the OBJ export feature allows you to seamlessly transfer your designs across platforms and applications.