Part II: Attaching an HDRI Image
Step 1. Attaching an HDRI
1.1. Reopen the dome light editor and enable the "Spherical" option. This will wrap the image around a full sphere in the scene.
1.2. Click the checkbox next to "Use Dome Texture" and then click the “m” button.
1.3. Select TexBitmap from the drop down.
1.4. Select any HDRI file from your hard drive.
1.5. Change the UVW Type to UVWGenEnvironment
1.6. Make sure that the "Mapping Type is set to "Spherical" if you are using a spherical HDRI. Notice that we support additional mapping type to match any HDRI type.
1.7. Render the scene.
You will see HDRI file has added trees and clouds to your background and is providing a more natural light to the scene.