vtk.vtkOBJExporter未导出整个渲染

Question

我正在尝试将VTK渲染导出为要在Meshlab中查看的OBJ文件。在我在Meshlab中打开.obj文件之前，一切都是正常的，在该文件中，仅导出了球体，而没有任何连接球体的管。我曾尝试以不同的文件类型导出渲染，但由于某些原因，仅导出球体。可能是因为管状过滤器实际上没有创建3D对象吗？正在寻找解决此问题的任何方法！编写器位于代码的底部。谢谢

np={} 
for n in G.nodes():
    
    np[n]=node_pos[n] 

nodePoints = vtk.vtkPoints() 

i=0 

for (x,y,z) in np.values(): 
    nodePoints.InsertPoint(i, x, y, z) 
    i=i+1 

# Create a polydata to be glyphed. 
inputData = vtk.vtkPolyData() 
inputData.SetPoints(nodePoints) 

# Use sphere as glyph source. 
balls = vtk.vtkSphereSource() 
balls.SetRadius(.1) 
balls.SetPhiResolution(20) 
balls.SetThetaResolution(20) 

glyphPoints = vtk.vtkGlyph3D() 
glyphPoints.SetInputData(inputData) 
glyphPoints.SetSourceData(balls.GetOutput()) 

glyphMapper = vtk.vtkPolyDataMapper() 
glyphMapper.SetInputData(glyphPoints.GetOutput()) 

glyph = vtk.vtkActor() 
glyph.SetMapper(glyphMapper) 
glyph.GetProperty().SetDiffuseColor(plum) 
glyph.GetProperty().SetSpecular(.3) 
glyph.GetProperty().SetSpecularPower(30) 

# Generate the polyline for the spline. 
points = vtk.vtkPoints() 
edgeData = vtk.vtkPolyData() 

# Edges 

lines = vtk.vtkCellArray() 
i=0 
for e in G.edges: 

    u=e[0] 
    v=e[1] 

    lines.InsertNextCell(2) 

    for n in (u,v): 
        (x,y,z)=node_pos[n] 
        points.InsertPoint(i, x, y, z) 
        lines.InsertCellPoint(i) 
        i=i+1 

edgeData.SetPoints(points) 
edgeData.SetLines(lines) 


Tubes = vtk.vtkTubeFilter() 
Tubes.SetNumberOfSides(16) 
Tubes.SetInputData(edgeData) 
Tubes.SetRadius(0.05)       # edge RADIUS 

profileMapper = vtk.vtkPolyDataMapper() 
profileMapper.SetInputData(Tubes.GetOutput()) 

balls.Update()

glyphPoints.Update()

Tubes.Update()    


profile = vtk.vtkActor() 
profile.SetMapper(profileMapper) 
profile.GetProperty().SetDiffuseColor(banana) 
profile.GetProperty().SetSpecular(.3) 
profile.GetProperty().SetSpecularPower(30) 


ren = vtk.vtkRenderer() 
renWin = vtk.vtkRenderWindow() 
renWin.AddRenderer(ren) 

iren = vtk.vtkRenderWindowInteractor() 
iren.SetRenderWindow(renWin) 

ren.AddActor(profile)
ren.AddActor(glyph) 
 

renWin.SetSize(1000, 1000) 

iren.Initialize() 
renWin.Render() 

iren.Start()     

writer = vtk.vtkOBJExporter()
writer.SetFilePrefix('test')
writer.SetInput(renWin)
writer.Write()