Build (game engine)

Build Engine

Screenshot showing Build in 2D mode
Developer(s)	Ken Silverman
Initial release	September 30, 1995; 29 years ago (1995-09-30)
Repository	advsys.net/ken/buildsrc/
Successor	Build 2
License	Source-available[1]
Website	advsys.net/ken/build.htm

The Build Engine is a first-person shooter engine created by Ken Silverman, author of Ken's Labyrinth, for 3D Realms. Like the Doom engine, the Build Engine represents its world on a two-dimensional grid using closed 2D shapes called sectors, and uses simple flat objects called sprites to populate the world geometry with objects.

The Build Engine is generally considered to be a 2.5D engine, as the basic world geometry is two-dimensional with an added height component, allowing each sector to have a different ceiling height and floor height. Some floors can be lower and some can be higher; the same is true with ceilings (in relation to each other). Floors and ceilings can hinge along one of the sector's walls, resulting in a slope. With this information, the Build Engine renders the world in a way that looks three-dimensional, unlike modern game engines that create actual 3D environments.

Though the Build Engine achieved most of its fame from powering the 1996 first-person shooter Duke Nukem 3D, it was also used for many other games.