HI: I am trying to light a scene with HDRI. I received some free HDRI's files from 3D World. NOt sure if I am doing ti correctly. I have clicked on "Scene" and then under the "background" area of the "Effects" tab, I clicked on the HDRI and loaded my picture. I then added a gradient blue in the "Backdrop" area. Is this correct? Do I need to add lights to my scene after that. I presently have lights. But I am trying to light the scene from the HDRI file. Any help would be appreciated.