Meshroom is a powerful photogrammetry software that allows users to create 3D models from photographs. Once you have completed your 3D reconstruction in Meshroom, you may want to export the model as an OBJ file for use in other 3D software. Here's how you can do that:

1. Open your Meshroom project that contains the completed 3D reconstruction.

2. In the Workspace panel, select the node that represents the final reconstructed mesh. This node is typically called 'Texturing.'

3. Click on the node to bring up its parameters in the Node Graph panel.

4. Look for the 'Export' section in the parameters, which allows you to specify the file format for the export. Select 'OBJ' from the dropdown menu.

5. Choose a location on your computer to save the exported OBJ file, and enter a name for the file.

6. Finally, click the 'Export' button to generate the OBJ file.

Once the export process is complete, you will have an OBJ file that represents your 3D model, which can be imported into other 3D software for further editing, rendering, or 3D printing. It's important to note that while the OBJ format is widely supported by various 3D software, some details of the original model such as texture information may not be preserved in the OBJ file. Therefore, you may need to reapply textures or make adjustments to the model after importing it into a new software.

In conclusion, exporting a 3D model from Meshroom as an OBJ file is a straightforward process that allows you to use your reconstructed model in other 3D workflows. By following the steps outlined above, you can easily transfer your Meshroom creations into a variety of 3D software environments for further exploration and refinement.