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93 lines
3.3 KiB
93 lines
3.3 KiB
2 years ago
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#!/usr/bin/env python
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# This example shows how to extract portions of an unstructured grid
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# using vtkExtractUnstructuredGrid. vtkConnectivityFilter is also used
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# to extract connected components.
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#
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# The data found here represents a blow molding process. Blow molding
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# requires a mold and parison (hot, viscous plastic) which is shaped
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# by the mold into the final form. The data file contains several steps
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# in time for the analysis.
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import vtk
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from vtk.util.misc import vtkGetDataRoot
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VTK_DATA_ROOT = vtkGetDataRoot()
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# Create a reader to read the unstructured grid data. We use a
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# vtkDataSetReader which means the type of the output is unknown until
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# the data file is read. So we follow the reader with a
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# vtkCastToConcrete and cast the output to vtkUnstructuredGrid.
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reader = vtk.vtkDataSetReader()
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reader.SetFileName(VTK_DATA_ROOT + "/Data/blow.vtk")
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reader.SetScalarsName("thickness9")
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reader.SetVectorsName("displacement9")
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castToUnstructuredGrid = vtk.vtkCastToConcrete()
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castToUnstructuredGrid.SetInputConnection(reader.GetOutputPort())
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warp = vtk.vtkWarpVector()
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warp.SetInput(castToUnstructuredGrid.GetUnstructuredGridOutput())
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# The connectivity filter extracts the first two regions. These are
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# know to represent the mold.
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connect = vtk.vtkConnectivityFilter()
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connect.SetInputConnection(warp.GetOutputPort())
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connect.SetExtractionModeToSpecifiedRegions()
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connect.AddSpecifiedRegion(0)
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connect.AddSpecifiedRegion(1)
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moldMapper = vtk.vtkDataSetMapper()
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moldMapper.SetInputConnection(reader.GetOutputPort())
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moldMapper.ScalarVisibilityOff()
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moldActor = vtk.vtkActor()
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moldActor.SetMapper(moldMapper)
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moldActor.GetProperty().SetColor(.2, .2, .2)
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moldActor.GetProperty().SetRepresentationToWireframe()
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# Another connectivity filter is used to extract the parison.
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connect2 = vtk.vtkConnectivityFilter()
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connect2.SetInputConnection(warp.GetOutputPort())
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connect2.SetExtractionModeToSpecifiedRegions()
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connect2.AddSpecifiedRegion(2)
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# We use vtkExtractUnstructuredGrid because we are interested in
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# looking at just a few cells. We use cell clipping via cell id to
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# extract the portion of the grid we are interested in.
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extractGrid = vtk.vtkExtractUnstructuredGrid()
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extractGrid.SetInputConnection(connect2.GetOutputPort())
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extractGrid.CellClippingOn()
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extractGrid.SetCellMinimum(0)
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extractGrid.SetCellMaximum(23)
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parison = vtk.vtkGeometryFilter()
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parison.SetInputConnection(extractGrid.GetOutputPort())
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normals2 = vtk.vtkPolyDataNormals()
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normals2.SetInputConnection(parison.GetOutputPort())
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normals2.SetFeatureAngle(60)
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lut = vtk.vtkLookupTable()
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lut.SetHueRange(0.0, 0.66667)
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parisonMapper = vtk.vtkPolyDataMapper()
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parisonMapper.SetInputConnection(normals2.GetOutputPort())
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parisonMapper.SetLookupTable(lut)
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parisonMapper.SetScalarRange(0.12, 1.0)
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parisonActor = vtk.vtkActor()
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parisonActor.SetMapper(parisonMapper)
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# graphics stuff
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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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iren = vtk.vtkRenderWindowInteractor()
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iren.SetRenderWindow(renWin)
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# Add the actors to the renderer, set the background and size
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ren.AddActor(parisonActor)
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ren.AddActor(moldActor)
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ren.SetBackground(1, 1, 1)
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ren.ResetCamera()
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ren.GetActiveCamera().Azimuth(60)
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ren.GetActiveCamera().Roll(-90)
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ren.GetActiveCamera().Dolly(2)
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ren.ResetCameraClippingRange()
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renWin.SetSize(500, 375)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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