Pyiges Usage

There are two ways the pyiges module can open iges files. First, use the read function:

pyiges.read(filename)

Read an iges file.

Parameters

filename (str) – Filename of an IGES file.

Examples

>>> import pyiges
>>> from pyiges import examples
>>> iges = pyiges.read(examples.impeller)
    pyiges.Iges object
    Description:
    Number of Entities: 4615

Alternatively, you can create an object directly from the Iges class:

>>> import pyiges
>>> iges = pyiges.Iges('my_file.iges')
pyiges.Iges object
Description:
Number of Entities: 4615
class pyiges.Iges(filename)

pyiges.Iges object

Parameters

filename (str) – Filename of an IGES file.

Examples

>>> import pyiges
>>> from pyiges import examples
>>> iges = pyiges.read(examples.impeller)
    pyiges.Iges object
    Description:
    Number of Entities: 4615
bspline_surfaces(as_vtk=False, merge=False, **kwargs)

All bsplines

Examples

Convert and plot all bspline surfaces. This takes a while since the geometry tessellation is done in pure python by geomdl. Reduce the conversion time by setting delta to a larger than default value (0.025)

>>> mesh = iges.bspline_surfaces(as_vtk=True, merge=True)
>>> mesh.plot()

Alternatively, just extract the B-REP surfaces and extract their parameters

>>> bsurf = iges.bspline_surfaces()
>>> bsurf[0]
Rational B-Spline Surface
    Upper index of first sum:        3
    Upper index of second sum:       3
    Degree of first basis functions: 3
    Degree of second basis functions: 3
    Open in the first direction
    Open in the second direction
    Polynomial
    Periodic in the first direction
    Periodic in the second direction
    Knot 1: [0. 0. 0. 0. 1. 1. 1. 1.]
    Knot 2: [0. 0. 0. 0. 1. 1. 1. 1.]
    u0: 1.000000
    u1: 0.000000
    v0: 1.000000
    v1: 128.000000
    Control Points: 16
bsplines(as_vtk=False, merge=False, **kwargs)

All bsplines

circular_arcs(to_vtk=False, merge=False, **kwargs)

All circular_arcs

edge_lists(as_vtk=False, merge=False, **kwargs)

All Edge Lists

entities()

Return a list of all entities

Examples

>>> iges.entities
[<pyiges.geometry.Point at 0x7f7056069c10>,
 <pyiges.geometry.Point at 0x7f7056069790>,
 <pyiges.geometry.Point at 0x7f7056069a50>,
 <pyiges.geometry.Point at 0x7f7056069b10>,
 <pyiges.entity.Entity at 0x7f7056069910>]
from_pointer(ptr)

Return an iges object according to an iges pointer

lines(as_vtk=False, merge=False, **kwargs)

All lines

points(as_vtk=False, merge=False, **kwargs)

Return all points

to_vtk(lines=True, bsplines=True, surfaces=True, points=True, delta=0.025, merge=True)

Converts entities to a vtk object

Parameters

  • lines (bool, optional) – Convert lines.

  • surfaces (bool, optional) – Convert B-Spline surfaces.

  • points (bool, optional) – Convert points.

  • delta (float, optional) – Resolution when converting spline entities. Higher resolution creates a better plot at the cost of computing time.

  • merge (bool, optional) – Merge all converted entites into one output.

Returns

surf – Geometry represented as pyvista.PolyData if merged or a MultiBlock if unmerged.

Return type

pyvista.PolyData or pyvista.MultiBlock

Examples

Convert all entities except for surfaces to vtk

>>> lines = iges.to_vtk(surfaces=False)
>>> print(lines)
PolyData (0x7f700c79f3d0)
  N Cells:      2440
  N Points:     96218
  X Bounds:     -4.299e+01, 6.912e+14
  Y Bounds:     -4.255e+01, 6.290e+14
  Z Bounds:     -9.980e+02, 6.702e+14
  N Arrays:     0
vertex_lists(as_vtk=False, merge=False, **kwargs)

All Point Lists