where the return of the probe was expected to close the black hole. Development Outcasts graphics engine is mainly a combination of a ray casting (heightmap) engine, used to render the landscape, and a texture mapping polygon engine used to render objects. The "Engine Programming" section of the credits in the manual has several subsections related to graphics, among them: "Landscape Engine", "Polygon Engine", "Water & Shadows Engine" and "Special effects Engine". Although Outcast is often cited as a forerunner of voxel technology, this is somewhat misleading. The game does not actually model three-dimensional volumes of voxels. Instead, it models the ground as a surface, which may be seen as being made up of voxels. The ground is decorated with objects that are modeled using texture-mapped polygons. When Outcast was developed, the term "voxel engine", when applied to video games, commonly referred to a ray casting engine (for example the Voxel Space engine). On the engine technology page of the game's website, the landscape engine is also referred to as the "Voxels engine". The engine is purely software-based; it does not rely on hardware-acceleration via a 3D graphics card. Outcast features effects such as character shadows, depth of field, bump mapping and reflections. Anti-aliasing is used to smooth certain texture boundaries. The heightmap engine renders reliefs with self-occlusion, motion parallax, and silhouettes (but no shadowing), even for details such as cobblestones. Water surfaces appear both translucent and reflective. The surface appears to reflect the environment (the skybox) and appears rippled with moving waves, which react to the character's movement while in the water. The degree of translucency depends on the viewing angle. The more vertical the angle, the clearer the water appears while the more horizontal the angle, the stronger the reflections. Other visual effects include bloom and lens flares, falling snow, fire, and other glowing particles. The disadvantage of this type of CPU-intensive software-rendering was that Outcast required an extremely powerful CPU (nothing but the most powerful Intel Pentium III processors of the time, in the 500-600 MHz range) and massive amounts of RAM (128 megabytes were recommended) to run at full speed and maximum resolution (512x384). The AI used in Outcast was based on a proprietary engine codenamed GAIA, for Game Artificial Intelligence with Agents, which was composed by a set of C++ libraries based on research in distributed AI. Intelligence is represented as a distributed activity over