Works pretty easily with spotlights, however, keep in mind that for infinite lights the ShadowCams are reset each time you move the light or increase the overall expanse of your scene in the universe. After either of these changes, the Infinite lights' Shadowcams will automatically zoom out again, readjusting to include all objects in the universe that have "Cast Shadows" turned on in their Properties. btw - This shadowmap anti-aliasing is also the source of the frequent difficulty with getting proper ground shadows, and why turning off CastShadows for the Ground will usually solve the problem. Doing so prevents the ShadowCams from automatically zooming way out to include the entire Ground prop.