OFF (file format)

OFF geometry format

Filename extension	.off
Type of format	3D model format

OFF is a geometry definition file format containing the description of the composing polygons of the 3D object. ^[1]

Composition

• first line: number of vertices, number of faces, number of edges
• 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)

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  -1.0
 0.0   1.0  -1.0
-1.0   0.0  -1.0
 0.0  -1.0  -1.0
 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

1. "OFF file format (Princeton)".