OBJ Files
A 3D Object Format

OBJ is a data directory which contains examples of OBJ files, a format for storing a description of the surface of a 3D object, composed of triangles or higher degree polygons.

OBJ File Characteristics:

• ASCII (there is also a binary version, for which an "MOD" extension is used in the file name);
• Color;
• 3D;
• No compression;
• contain definitions of 1 or more named 3D objects;

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

MTL, a data directory which describes a file format used by OBJ to set material types.

Reference:

1. http://www.alias.com/eng/index.shtml, The Alias web site.

Sample files:

• cessna.obj, a Cessna airplane, using 3745 nodes and 3897 faces with orders from 3 up to 32.
• cessna.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• cube.obj, a cube, using 8 nodes and 12 faces of order 3;
• cube.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• diamond.obj, a diamond;
• diamond.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• dodecahedron.obj, a dodecahedron;
• dodecahedron.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• gourd.obj, a gourd, using 326 nodes and 648 faces of order 3.
• gourd.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• humanoid_quad.obj, a humanoid shape using 48 quadrilateral faces;
• humanoid_quad.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• humanoid_tri.obj, a humanoid shape using 64 nodes, and 96 faces of order 3;
• humanoid_tri.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• icosahedron.obj, an icosahedron;
• icosahedron.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• lamp.obj, a lamp;
• lamp.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• magnolia.obj, a magnolia blossom, using 806 nodes and 1247 faces;
• magnolia.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• octahedron.obj, an octahedron;
• octahedron.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• power_lines.obj, power lines;
• pyramid.obj, a pyramid;
• roi.obj, an MRI scan, originally a set of 3D voxels, now grouped into contiguous regions of interest, using 114,075 nodes, and 968 faces of order 4.
• roi.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• sandal.obj, a sandal, using 2,626 nodes, 3,196 faces of order up to 12.
• shuttle.obj, the Space Shuttle;
• shuttle.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• skyscraper.obj, a skyscraper, using 2,022 nodes, 1863 faces of order up to 16.
• skyscraper.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• slot_machine.obj, a slot machine, using 1,956 nodes, 2,225 faces of order up to 8.
• slot_machine.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• teapot.obj, a teapot, using 3644 nodes and 6320 faces of order 3.
• teapot.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• tetrahedron.obj, a tetrahedron, using 4 nodes and 4 faces of order 3.
• tetrahedron.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• trumpet.obj, a trumpet, using 11,908 nodes, and 11,362 faces of order up to 36.
• trumpet.png, a snapshot of the shape as displayed by OBJ_DISPLAY.
• violin_case.obj, a violin case, using 1080 nodes and 944 faces, of orders from 3 to 14.
• violin_case.png, a snapshot of the shape as displayed by OBJ_DISPLAY.

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