Read an IGES file

Note

Go to the end to download the full example code.

Read an IGES file#

IGES (.iges / .igs) is one of the older neutral CAD interchange formats, still common for legacy mechanical hand-offs and turbomachinery. pyvista_cad.read_iges wraps pyiges and tessellates analytic surfaces with geomdl.

This example uses a real centrifugal impeller exported from SolidWorks to IGES (MIT, pyiges) and pushes beyond a load+plot demo by computing surface curvature, the kind of analysis turbomachinery engineers routinely run on imported IGES geometry.

import numpy as np
import pyvista as pv

import pyvista_cad
from pyvista_cad.examples import downloads

Load the real impeller. surfaces=True tessellates every analytic B-spline surface; lines=False drops the construction wires.

iges = pyvista_cad.read_iges(
    downloads.iges_impeller_path(),
    bsplines=True,
    surfaces=True,
    lines=False,
)
iges

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PolyData (0x7f1a876206a0)
  N Cells:    753716
  N Points:   488880
  N Strips:   0
  X Bounds:   -5.052e+01, 4.945e+01
  Y Bounds:   -6.144e+01, 6.144e+01
  Z Bounds:   -4.577e+01, 6.388e+00
  N Arrays:   2

Compute mean curvature on the impeller surface. Mean curvature highlights the convex blade ridges and concave hub fillets: the regions a CFD or stress engineer wants to refine first. (Gaussian curvature on a near-developable blade is ~0 almost everywhere and washes out; mean curvature reads far better.)

surface = iges.extract_surface().compute_normals()
surface['mean_curvature'] = surface.curvature(curv_type='mean')
surface

/home/runner/work/pyvista-cad/pyvista-cad/examples/01_readers/read_iges.py:44: PyVistaFutureWarning: The default value of `algorithm` for the filter
`PolyData.extract_surface` will change in the future. It currently defaults to
`'dataset_surface'`, but will change to `None`. Explicitly set the `algorithm` keyword to
silence this warning.
  surface = iges.extract_surface().compute_normals()

PolyData (0x7f1a876ab280)
  N Cells:    753716
  N Points:   488880
  N Strips:   0
  X Bounds:   -5.052e+01, 4.945e+01
  Y Bounds:   -6.144e+01, 6.144e+01
  Z Bounds:   -4.577e+01, 6.388e+00
  N Arrays:   7

Render with a diverging colormap centred on zero so flat regions sit mid-scale and ridges / valleys pop. Symmetric, robust clim from the 90th percentile of the absolute curvature keeps a few extreme outliers from flattening the contrast.

q = float(np.nanpercentile(np.abs(surface['mean_curvature']), 90))

pl = pv.Plotter()
pl.cad.add(
    surface,
    scalars='mean_curvature',
    cmap='RdBu_r',
    clim=(-q, q),
    scalar_bar_args={'title': 'Mean curvature'},
)
pl.show()

Static Scene

Interactive Scene

Total running time of the script: (0 minutes 38.776 seconds)