cadquery -> PyVista

Convert a cadquery Workplane straight to a pyvista.PolyData by tessellating its underlying OCCT shape.

This example mirrors cadquery’s classic OCC bottle demo (a swept, filleted, hollowed bottle body), which is the canonical proof that a cadquery script can produce real CAD geometry, not just a primitive.

import cadquery as cq
import pyvista as pv

import pyvista_cad

Adapted from cadquery’s examples/Ex030_Classic_OCC_Bottle.py: a swept rectangular base with semicircular ends, a neck cylinder, and a hollow interior.

L, w, t = 80.0, 40.0, 30.0

points = [
    (0.0, -w / 2),
    (L / 2, -w / 2),
    (L / 2, 0),
    (0.0, w / 2),
    (-L / 2, 0),
    (-L / 2, -w / 2),
    (0.0, -w / 2),
]

bottle = (
    cq.Workplane('XY')
    .polyline(points)
    .close()
    .extrude(t)
    .edges('|Z')
    .fillet(t / 4)
    .faces('>Z')
    .workplane()
    .circle(t / 4)
    .extrude(t / 2)
    .faces('>Z')
    .shell(-1.0)
)

Convert with a fine deflection so the curved fillets are smooth.

mesh = pyvista_cad.from_cadquery(bottle, linear_deflection=0.2)
mesh

PolyData (0x7f6fa8111180)
  N Cells:    832
  N Points:   732
  N Strips:   0
  X Bounds:   -4.000e+01, 4.000e+01
  Y Bounds:   -2.000e+01, 1.911e+01
  Z Bounds:   0.000e+00, 4.500e+01
  N Arrays:   1

PolyData 732 points 832 cells 59 KiB

Bounds⧉X [-4.000e+01, 4.000e+01]Y [-2.000e+01, 1.911e+01]Z [0.000e+00, 4.500e+01]

Cellsfaces 832

• Field Data: (1)
  • cad.source_format⧉
    (1,)
    <U8

Render colored by Z so the neck and base both read.

mesh['Z (mm)'] = mesh.points[:, 2]

pl = pv.Plotter()
pl.cad.add(mesh, scalars='Z (mm)', cmap='viridis')
pl.show()

Static Scene

Interactive Scene