Cinema 4D is a powerful 3D modeling and animation software used by professionals in various industries. If you're looking to export your 3D models from Cinema 4D to use in other applications, such as game engines or rendering software, the OBJ file format is a popular choice. Here's a step-by-step guide on how to export an OBJ from Cinema 4D.

Step 1: Open your 3D model in Cinema 4D. Make sure your model is fully prepared and ready for export, including any textures, materials, and UV mapping.

Step 2: Select the model or models you want to export. You can do this by clicking and dragging your mouse to create a selection box around the objects, or by using the object manager to select them individually.

Step 3: With your model selected, go to the 'File' menu and choose 'Export' > 'Wavefront OBJ (.obj)'. This will open the export settings window.

Step 4: In the export settings window, you can choose the options for exporting your OBJ file. This includes options for including materials, normals, and UV coordinates. Make sure to adjust these settings based on your specific needs.

Step 5: Choose a location on your computer to save the OBJ file, and then click 'Save' to export your model as an OBJ.

Step 6: Once the export is complete, you can open the exported OBJ file in other 3D applications or game engines. Make sure to check for any issues with textures, materials, or UV mapping to ensure compatibility with the new application.

By following these steps, you can easily export your 3D models from Cinema 4D as OBJ files for use in other applications. Keep in mind that OBJ files may not support all of the advanced features of Cinema 4D, so some adjustments may be necessary when importing into a new application. With this knowledge, you can confidently share and use your 3D creations across different platforms and software.