OBJ format

The OBJ file format is an ASCII form. It supports a variety of geometry ranging from polygons to high degree NURBS surfaces.

The following types of data may be included in an OBJ file. In this list, the keyword (in parentheses) follows the data type.

Vertex data

geometric vertices (v)
texture vertices (vt)
vertex normals (vn)
parameter space vertices (vp)

Free-form curve/surface attributes

rational or non-rational forms of curve or surface type.

Basis matrix, Bezier, B-spline, Cardinal, Taylor (cstype)

degree (deg)
basis matrix (bmat)
step size (step)

Elements

point (p)
line (l)
face (f)
curve (curv)
2D curve (curv2)
surface (surf)

Free-form curve/surface body statements

parameter values (parm)
outer trimming loop (trim)
inner trimming loop (hole)
special curve (scrv)
special point (sp)
end statement (end)

Connectivity between free-form surfaces

connect (con)

Grouping

group name (g)
smoothing group (s)
merging group (mg)
object name (o)

Display/render attributes

bevel interpolation (bevel)
color interpolation (c_interp)
dissolve interpolation (d_interp)
level of detail (lod)
material name (usemtl)
material library (mtllib)
shadow casting (shadow_obj)
ray tracing (trace_obj)
curve approximation technique (ctech)
surface approximation technique (stech)

OBJ import options
OBJ export options

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