.TRI File Extension

3D model file created by FaceGen, an application used to create 3D human faces; contains a polygonal mesh for a human head; may also contain morphs, which are used for facial animations; often used for creating video game characters.

TRI files are used by Bethesda Softworks video games such as FallOut 3 and The Elder Scrolls IV: Oblivion.

3D mesh file created in the text-based TRI format; stores the mesh using x, y, z coordinate vertices and triangular polygons, which reference the declared vertices; used for constructing surfaces for 3D models.

There are some variations of the TRI file format, but the most basic version contains a one-line header followed by the vertices and triangles, where the header specifies the number of vertices and triangles.

TRI files are often used by scientific visualization or molecular modeling applications.