If you are working with 3D modeling and UV mapping, you might need to export UV's off an OBJ (Wavefront .obj) file for various purposes. Thankfully, it can be easily done using most 3D software. Here's how you can do it using popular 3D software such as Blender, Maya, and 3ds Max:

Blender:

1. Open your OBJ file in Blender.

2. Go to the UV Editing workspace.

3. Select all the UVs by pressing A.

4. Go to UV > Export UV Layout.

5. Choose the desired options such as image size and format, and click Export UVs to save the UV layout.

Maya:

1. Open your OBJ file in Maya.

2. Go to the UV Texture Editor.

3. Select all the UVs by pressing Ctrl + A.

4. Go to Polygons > UV Snapshot.

5. Choose the desired options such as image size and format, and click OK to save the UV snapshot.

3ds Max:

1. Open your OBJ file in 3ds Max.

2. Go to the Edit UVWs mode.

3. Select all the UVs by pressing Ctrl + A.

4. Go to Tools > Render UVW Template.

5. Choose the desired options such as image size and format, and click Render UVW Template to save the UV template.

In addition to these steps, you can also use various 3D software-specific plugins or scripts to streamline the process of exporting UV's off an OBJ file. These plugins and scripts can offer more advanced options and ease the overall workflow.

Once you have exported the UVs, you can use them for tasks such as creating textures, baking maps, or transferring the UV layout to another model. Understanding how to export UV's off an OBJ file is an essential skill for 3D artists and can greatly enhance the efficiency and quality of your 3D modeling and UV mapping projects.

So, whether you are a beginner or an experienced 3D artist, knowing how to export UV's off an OBJ file using various 3D software is a valuable skill that can open up new possibilities and improve your workflow.