OFF (file format)

OFF geometry format

Filename extension	.off
Type of format	3D model format

OFF (Object File Format) is a geometry definition file format containing the description of the composing polygons of the 3D object.

Composition

• first line: number of vertices, number of faces, number of edges (can be ignored)
• list of vertices: X, Y and Z coordinates
• list of faces: number of vertices, followed by the sequence number of the composing vertices (indexed from zero)
• normal of the faces can be determined using the right-hand rule.

Example

OFF
#  cube.off
#  A cube

8 6 12
1.0   0.0   1.0
0.0   1.0   1.0
-1.0   0.0   1.0
0.0  -1.0   1.0
1.0   0.0  0.0
0.0   1.0  0.0
-1.0   0.0  0.0
0.0  -1.0  0.0
4  0 1 2 3  
4  7 4 0 3  
4  4 5 1 0  
4  5 6 2 1  
4  3 2 6 7  
4  6 5 4 7

External links

• Description of the OFF format in the Geomview manual