Second Life is an online virtual world (metaverse). In 2013 it had approximately one million regular users. In many ways, Second Life is similar to massively multiplayer online role-playing games but the developer Linden Lab is emphatic that their creation is not a game: "There is no manufactured conflict, no set objective". Second Life users, also called residents, create virtual representations of themselves, called avatars, and are able to interact with places, objects and other avatars. They can explore the world (known as the grid), meet other residents, socialize, participate in both individual and group activities, build, create, shop, and trade virtual property and services with one another. The platform principally features 3D-based user-generated content. Second Life also has its own virtual currency, the Linden Dollar, which is exchangeable with real world currency.
Second Life is great for in-game photography because residents express themselves creatively through virtual world adaptations of art exhibits, live music, live theater and machinima, as well as other art forms.
Shadow is at least as important as light. In Second Life you can use Firestom as a viewer. The Linden Labs internal viewer is okay, but Firestorm offers much more possibilities. https://www.firestormviewer.org/