There are 2 file types use the .TRI file extension:
1. FaceGen Polygonal Model File

- Developer Singular Inversions
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Popularity
- Category 3D Image Files
- Format Binary
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.
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Updated: March 12, 2011
2. Triangle Mesh File

- Developer N/A
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Popularity
- Category 3D Image Files
- Format Text
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.
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Updated: July 25, 2018