[vtkusers] vtkTubeFilter doesn't create a closed loop

[Maximilian Wormser]

Oh what a shame :( do you know where the best place is to submit this as a feature request?

 

Von: David Gobbi [mailto:david.gobbi at gmail.com] 
Gesendet: Dienstag, 19. Juli 2016 14:58
An: Maximilian Wormser <max.wormser at gmx.de>
Cc: VTK Users <vtkusers at vtk.org>
Betreff: Re: [vtkusers] vtkTubeFilter doesn't create a closed loop

 

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 <mailto: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 <mailto:lihouxing at yeah.net> ] 
Gesendet: Dienstag, 19. Juli 2016 11:02
An: max.wormser at gmx.de <mailto:max.wormser at gmx.de> ; vtkusers at vtk.org <mailto: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 <mailto: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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