[vtkusers] vtkTubeFilter doesn't create a closed loop

[David Gobbi]

Hi Maximilian,

I did a quick read-through of the code for vtkTubeFilter, and it doesn't
check to see if the first and last points are the same point.  So unless
someone provides a fix, you might be out of luck.

 - David

On Tue, Jul 19, 2016 at 4:38 AM, Maximilian Wormser <max.wormser at gmx.de>
wrote:

> Good idea, but SetCappingOff or SetCappingOn do not change the underlying
> problem.
>
>
>
> *Von:* lihouxing [mailto:lihouxing at yeah.net]
> *Gesendet:* Dienstag, 19. Juli 2016 11:02
> *An:* max.wormser at gmx.de; vtkusers at vtk.org
> *Betreff:* Re:[vtkusers] vtkTubeFilter doesn't create a closed loop
>
>
>
> maybe you should set "capping off"
>
>
>
>
>
>
>
> 发自我的小米手机
>
> 在 Maximilian Wormser <max.wormser at gmx.de>，2016年7月19日 下午3:51写道：
>
> Hey all,
>
>
>
> I want to create closed loops with vtkTubeFilter, but at the point where
> the first and the last point meet there is always a misconnection.
> vtkStripper and vtkCleanPolyData do not help in this case. I already posted
> my problem to stackoverflow, but without any solutions so far. Here is a
> link to my submission:
> http://stackoverflow.com/questions/38266711/creating-a-closed-loop-with-vtktubefilter
>
>
>
> Here’s a minimal working example to reproduce the behavior:
>
>
>
> import vtk
>
>
>
>
>
> def rendering(mapper):
>
>     """Takes mapper and handles the rendering."""
>
>     actor = vtk.vtkActor()
>
>     actor.SetMapper(mapper)
>
>
>
>     # Create a renderer, render window, and interactor
>
>     renderer = vtk.vtkRenderer()
>
>     renderWindow = vtk.vtkRenderWindow()
>
>     renderWindow.AddRenderer(renderer)
>
>     renderWindowInteractor = vtk.vtkRenderWindowInteractor()
>
>     renderWindowInteractor.SetRenderWindow(renderWindow)
>
>     # Add the actors to the scene
>
>     renderer.AddActor(actor)
>
>     # Render and interact
>
>     renderWindow.Render()
>
>     renderWindowInteractor.Start()
>
>     return
>
>
>
> pts = vtk.vtkPoints()
>
> pts.SetNumberOfPoints(4)
>
> pts.SetPoint(0, 0.5, 0, 0)
>
> pts.SetPoint(1, 1, 0.5, 0)
>
> pts.SetPoint(2, 0.5, 1, 0)
>
> pts.SetPoint(3, 0, 0.5, 0)
>
>
>
> lines = vtk.vtkCellArray()
>
> lines.InsertNextCell(5)
>
> lines.InsertCellPoint(0)
>
> lines.InsertCellPoint(1)
>
> lines.InsertCellPoint(2)
>
> lines.InsertCellPoint(3)
>
> lines.InsertCellPoint(0)
>
>
>
> poly = vtk.vtkPolyData()
>
> poly.SetPoints(pts)
>
> poly.SetLines(lines)
>
>
>
> tubes = vtk.vtkTubeFilter()
>
> tubes.SetInputData(poly)
>
> tubes.CappingOn()
>
> tubes.SidesShareVerticesOff()
>
> tubes.SetNumberOfSides(4)
>
> tubes.SetRadius(0.1)
>
> tubes.Update()
>
>
>
> mapper = vtk.vtkPolyDataMapper()
>
> mapper.SetInputData(tubes.GetOutput())
>
> rendering(mapper)
>
>
>
> Thanks in advance for any help!
>
>
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