OBJ

class compas.files.OBJ[source]

Bases: object

Class for working with OBJ files.

Currently, reading is only supported for polygonal geometry. Writing is only supported for meshes.

Parameters:

filepathpath string | file-like object | URL string: A path, a file-like object or a URL pointing to a file.
precisionstr, optional: A COMPAS precision specification.

References

http://paulbourke.net/dataformats/obj/

Examples

Reading and writing of a single mesh.

>>> from compas.datastructures import Mesh
>>> from compas.files import OBJ

Write mesh data to a file.

>>> mesh = Mesh.from_polyhedron(12)
>>> obj = OBJ("mesh.obj")
>>> obj.write(mesh)

Read mesh data from a file.

>>> obj = OBJ("mesh.obj")
>>> obj.read()
>>> mesh = Mesh.from_vertices_and_faces(obj.vertices, obj.faces)

Reading and writing of multiple meshes as separate objects in a single OBJ file.

>>> from compas.geometry import Pointcloud, Translation
>>> from compas.datastructures import Mesh
>>> from compas.files import OBJ

Write mesh data to a file.

>>> meshes = []
>>> for point in Pointcloud.from_bounds(10, 10, 10, 100):
...     mesh = Mesh.from_polyhedron(12)
...     mesh.transform(Translation.from_vector(point))
...     meshes.append(mesh)
>>> obj = OBJ("meshes.obj")
>>> obj.write(meshes)

Read mesh data from a file.

>>> obj = OBJ("meshes.obj")
>>> obj.read()
>>> meshes = []
>>> for name in obj.objects:
...     mesh = Mesh.from_vertices_and_faces(*obj.objects[name])
...     mesh.name = name
...     meshes.append(mesh)

Attributes:

readerOBJReader, read-only: A OBJ file reader.
parserOBJParser, read-only: A OBJ data parser.
verticeslist[list[float]], read-only: The vertices found in the parsed data.
lineslist[tuple[int, int]], read-only: The lines found in the parsed data, as vertex pairs.
faceslist[list[int]], read-only: The faces found in the parsed data, as lists of vertices.
objectsdict[str, tuple[list[list[float, float, float]], list[list[int]]]], read-only: The objects found in the parsed data, as a mapping between object names and tuples of lists of vertices and faces.

Methods

`read`	Read and parse the contents of the file.
`write`	Write a mesh to the file.