In fact, photogrammetry, a technology that uses photos to generate 3D models, is an old technology with a history of nearly 200 years. It mainly relies on multiple photos and videos taken by the camera to calculate the shape, size and spatial position of the target object. Nowadays, with the help of the huge computing power of computers, many software programs can directly read the object data in the photo and generate a 3D model.

Unreal Engine (UE for short) is currently the most famous and widely authorized top 2D/3D multi-platform universal game engine for Windows and Mac OS X (written in C++) in the world, which has occupied 80% of the market share of the global commercial game engines. The great games developed based on it are numerous, including Unreal Tournament, Gears Of War, Mass Effect, BioShock, Borderlands, Mirror's Edge, and many other series of big game works.