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from vtkmodules.vtkCommonCore import (
vtkIdList,
vtkPoints,
)
from vtkmodules.vtkCommonDataModel import (
VTK_POLYHEDRON,
vtkPlane,
vtkUnstructuredGrid,
)
from vtkmodules.vtkFiltersCore import vtkCutter
from vtkmodules.vtkIOXML import (
vtkXMLPolyDataWriter,
vtkXMLUnstructuredGridWriter,
)
from vtkmodules.test import Testing
class TestPolyhedronCutter(Testing.vtkTest):
def setUp(self):
self.vtk_grid = vtkUnstructuredGrid()
# vertices of the non-convex polyhedron
vtk_points = vtkPoints()
vtk_points.InsertNextPoint(0.0, 0.0, 0.0)
vtk_points.InsertNextPoint(4.0, 0.0, 0.0)
vtk_points.InsertNextPoint(4.0, 2.0, 0.0)
vtk_points.InsertNextPoint(3.0, 2.0, 0.0)
vtk_points.InsertNextPoint(3.0, 1.0, 0.0)
vtk_points.InsertNextPoint(1.0, 1.0, 0.0)
vtk_points.InsertNextPoint(1.0, 2.0, 0.0)
vtk_points.InsertNextPoint(0.0, 2.0, 0.0)
vtk_points.InsertNextPoint(0.0, 0.0, 1.0)
vtk_points.InsertNextPoint(4.0, 0.0, 1.0)
vtk_points.InsertNextPoint(4.0, 2.0, 1.0)
vtk_points.InsertNextPoint(3.0, 2.0, 1.0)
vtk_points.InsertNextPoint(3.0, 1.0, 1.0)
vtk_points.InsertNextPoint(1.0, 1.0, 1.0)
vtk_points.InsertNextPoint(1.0, 2.0, 1.0)
vtk_points.InsertNextPoint(0.0, 2.0, 1.0)
self.vtk_grid.SetPoints(vtk_points)
# connectivity of the polyhedron
ids = vtkIdList()
ids.InsertNextId(10) # no. of faces
ids.InsertNextId(8) # face 1 no. of verts
ids.InsertNextId(0)
ids.InsertNextId(1)
ids.InsertNextId(2)
ids.InsertNextId(3)
ids.InsertNextId(4)
ids.InsertNextId(5)
ids.InsertNextId(6)
ids.InsertNextId(7)
ids.InsertNextId(8) # face 2 no. of verts
ids.InsertNextId(8)
ids.InsertNextId(9)
ids.InsertNextId(10)
ids.InsertNextId(11)
ids.InsertNextId(12)
ids.InsertNextId(13)
ids.InsertNextId(14)
ids.InsertNextId(15)
ids.InsertNextId(4)
ids.InsertNextId(0)
ids.InsertNextId(1)
ids.InsertNextId(9)
ids.InsertNextId(8)
ids.InsertNextId(4)
ids.InsertNextId(1)
ids.InsertNextId(2)
ids.InsertNextId(10)
ids.InsertNextId(9)
ids.InsertNextId(4)
ids.InsertNextId(2)
ids.InsertNextId(3)
ids.InsertNextId(11)
ids.InsertNextId(10)
ids.InsertNextId(4)
ids.InsertNextId(3)
ids.InsertNextId(4)
ids.InsertNextId(12)
ids.InsertNextId(11)
ids.InsertNextId(4)
ids.InsertNextId(4)
ids.InsertNextId(5)
ids.InsertNextId(13)
ids.InsertNextId(12)
ids.InsertNextId(4)
ids.InsertNextId(5)
ids.InsertNextId(6)
ids.InsertNextId(14)
ids.InsertNextId(13)
ids.InsertNextId(4)
ids.InsertNextId(6)
ids.InsertNextId(7)
ids.InsertNextId(15)
ids.InsertNextId(14)
ids.InsertNextId(4)
ids.InsertNextId(7)
ids.InsertNextId(0)
ids.InsertNextId(8)
ids.InsertNextId(15)
self.vtk_grid.InsertNextCell(VTK_POLYHEDRON, ids)
writer = vtkXMLUnstructuredGridWriter()
writer.SetInputData(self.vtk_grid)
writer.SetFileName('my_grid.vtu')
writer.Write()
def testCutterTriangles(self):
cutter = vtkCutter()
cutter.GenerateTrianglesOn() # triangle generation is enabled!
cutter_function = vtkPlane()
cutter_function.SetOrigin(0.0, 0.0, 0.5)
cutter_function.SetNormal(0.0, 0.0, 1.0)
cutter.SetCutFunction(cutter_function)
cutter.SetInputData(self.vtk_grid)
cutter.Update()
surface = cutter.GetOutput()
writer = vtkXMLPolyDataWriter()
writer.SetInputData(surface)
writer.SetFileName('surface_tri.vtp')
writer.Write()
self.assertTrue(surface.GetNumberOfCells() > 1)
def testCutterNoTriangles(self):
cutter = vtkCutter()
cutter.GenerateTrianglesOff() # triangle generation is disabled!
cutter_function = vtkPlane()
cutter_function.SetOrigin(0.0, 0.0, 0.5)
cutter_function.SetNormal(0.0, 0.0, 1.0)
cutter.SetCutFunction(cutter_function)
cutter.SetInputData(self.vtk_grid)
cutter.Update()
surface = cutter.GetOutput()
writer = vtkXMLPolyDataWriter()
writer.SetInputData(surface)
writer.SetFileName('surface_poly.vtp')
writer.Write()
self.assertEqual(surface.GetNumberOfCells(), 1)
if __name__ == "__main__":
Testing.main([(TestPolyhedronCutter, 'test')])
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