Isometric Screeshots were a feature of Indev. It was added on December 31, 2009. It was removed in Infdev because it was impossible to render the whole map using the same technic used in finite world.
These Screenshots were taken using the F7 key. It rendered all surface blocks to give an overview of the map using an Isometric angle, and the player, if they were in 3rd person mode. Sometimes bugs could happen. Only the loaded chunks were rendered, giving instead black chunks, or void, giving the ability to see caves.