FileInfo.com


.BSP File Extension


File Type Valve Game Map File
File Format File
Common? No
File Description Map file used by games developed by Valve; contains the layout information, objects, and resources for a level map; used by Half-Life, Half-Life 2, Team Fortress, Counter-Strike, Counter-Strike: Condition-Zero, and Portal.

BSP stands for "Binary Space Partitioning," which breaks up intricate polygons into convex sets; this allows 3D maps to be rendered more quickly.

BSP files are made up of "lumps," which are chunks of data that are defined in the file header; these include Entities, Nodes, Vertices, Planes, Leaves, Visibility, Faces, and Textures.
Program(s) that open bsp files Mac / Windows: Valve video games

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/bsp