If you're looking to work with 3D models in Photoshop, you may need to open an OBJ file. Here's a quick guide to help you through the process.

1. Ensure Compatibility: Before beginning, make sure you're using a compatible version of Photoshop that supports 3D capabilities. Not all versions of Photoshop have this feature, so it's important to check beforehand.

2. Import OBJ File: Once you've confirmed compatibility, go to the 'File' menu and select 'Open...' Navigate to the location of your OBJ file and select it. Photoshop should then recognize the file format and import the 3D model.

3. Adjust Settings: After importing the OBJ file, you may need to adjust the settings to optimize the 3D model for your particular project. This can include modifying the lighting, texture mapping, and other properties to achieve the desired look.

4. Edit and Render: With the OBJ file successfully opened in Photoshop, you can now begin editing and rendering the 3D model. Use the various tools and capabilities within Photoshop to manipulate the model, add textures, apply effects, and more.

5. Save and Export: Once you're satisfied with the changes made to the 3D model, you can save your work in Photoshop's native format or export it to a different file type for use in other applications.

It's important to note that working with 3D models in Photoshop may require some familiarity with its 3D capabilities. Additionally, depending on the complexity of the 3D model and your computer's hardware, you may experience varying performance levels while working with 3D content.

By following these steps, you can open an OBJ file in Photoshop and begin working with 3D models to enhance your creative projects. Whether you're designing product prototypes, creating 3D artwork, or exploring virtual reality experiences, Photoshop's 3D capabilities can offer a versatile set of tools for your needs.