Terrain file created by Terragen, a natural scenery generation program; contains terrain data referenced by Terragen to determine altitude of the terrain; includes integer values along y, z, and x-axes specifying the length, height, depth, etc. in Terragen's heightfield format for easy terrain transfer.

The TER file consists of 2 8-byte identifying strings and "chunks" of data. The structure will look similar to the following: 8-byte "TERRAGEN" string identifying the program. 8-byte "TERRAIN" string identifying the terrain. "SIZE" chunk that appears before altitude data identifying the size of the terrain. "XPTS" and "YPTS" chunks are required if the terrain is not square. "EOF" string at the end of the file if it's an older version Terragen. To import a TER file, select the Terrain tab, click Add Terrain, select Heightfield (load file), navigate to the TER file, and click Open.