Development
Blood is powered by a modified version of the Build engine created by Ken Silverman for 3D Realms. The Build engine renders its world on a two-dimensional grid using closed 2D shapes called "sectors" and simple flat objects called "sprites" to populate the world geometry with objects. It is generally considered to be a 2.5D engine, since the basic world geometry is two-dimensional with an added height component, as each sector may have a different ceiling and floor height, and the ceiling and floor may be angled along one line of the sector. However the final result is that the world looks three-dimensional due to the way the engine renders it. The version of the Build engine used in Blood also uses voxel technology for weapon and ammo pickups, powerups and occasionally decorations, such as the tombstones in the first level of episode one, "Cradle to Grave".
A central feature of Blood is an abundant (and often exaggerated) graphic violence, from which the game derives its name. Enemies can be blown to pieces, and the pieces often rain down on the player. Zombies' heads can be shot off and then kicked around like footballs, spewing fountains of blood. Enemies scream if set on fire or are otherwise injured, making sound an integral part of the violent atmosphere of Blood. The levels themselves are designed with the same spirit, as corpses, torture victims, and several grotesque situations are witnessed in the game. Collectively, these features caused public concern about Blood, leading to the release of a censored version.
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