Select an object and press the button "Bake" to perform the following process.
- Set up the bake.
- Create a single image from multiple materials for each of DIFUSE, ROUGHNESS, NORMAL.
- Recompose the material with the created image.
- Download https://github.com/SaitoTsutomu/Bake-Image/archive/refs/heads/master.zip
- Start Blender.
- Edit menu -> Preferences
- Select the "Add-ons" tab.
- Press the "Install ...".
- Select the downloaded ZIP file and press the button "Install Add-on".
- Check the "Object: Bake Image".
- Select the object with a material.
- Show the sidebar and select the Edit tab.
- Set the image width and height.
- Press the button "Bake".
When use_selected_to_active is checked, set the active object as follows.
- One material_slots
- Empty Base Color