pyiges 0.1.2

Pythonic IGES reader

Python IGES reader with basic functionality to read an IGES file and convert some entities to a pyvista or vtk mesh.

This module can read in and perform basic parsing of all entities and can perform additional parsing and geometry visualization of the following entities:

• Vertex List (Type 502 Form 1)

• Edge List

• Loop (for specifying a bounded face for BREP geometries

• Face

• Circular arc

• Rational B-Spline Surface

• Rational B-Spline Curve

• Conic Arc (Type 104)

• Line

• Point

Installation

Install with pip using:

pip install pyiges

Otherwise, if you want the bleeding edge version, feel free to clone this repo and install with:

git clone https://github.com/pyvista/pyiges
cd pyiges
pip install .

Usage

The pyiges module can read in many entities as raw text, but only NURBS surfaces and bsplines can be converted to pyvista meshes.

import pyiges
from pyiges import examples

# load an example impeller
iges = pyiges.read(examples.impeller)

# print an invidiual entity (boring)
print(iges[0])

# convert all lines to a vtk mesh and plot it
lines = iges.to_vtk(bsplines=True, surfaces=False, merge=True)
lines.plot(color='w', line_width=2)

# convert all surfaces to a vtk mesh and plot it
mesh = iges.to_vtk(bsplines=False, surfaces=True, merge=True, delta=0.05)
mesh.plot(color='w', smooth_shading=True)
# control resolution of the mesh by changing "delta"

# save this surface to file
mesh.save('mesh.ply')  # as ply
mesh.save('mesh.stl')  # as stl
mesh.save('mesh.vtk')  # as vtk

Lines

Surfaces

Acknowledgments

Sample impeller was obtained from http://3dgallery.gks.com/2013/impeller/igs.php

Substantial code was obtained from or inspired by https://github.com/cfinch/IGES-File-Reader

IGES reference definitions were obtained from Eclipse IGES Wiki,