[vtkusers] tubular structure

[EDSB EDSB]

David, thank you very much for your kind answer!
I was able to do what I want.
Hoping that I'm not bothering you too much, could I ask you another question?
I
have a volumetric image (in dicom or in metaimage) made of zero voxels
and some non-zero voxels, representing a 3D geometry (a cube).
I would like to subtract from this volume the tube that I have create by vtktubefilter, but I have some problems:
1)
I have two different classes: the image is a VtkImageData, the tube is
a VtkPolyData (isn't it?); how can I get the same format, how can I
subtract them?
2)the tube is empty inside. I need a volume, not a surface.
I
know that these question can seem quite banal, but I couldn't find any
good tutorial about VTK classes on the web. I rely on buying VTK user's
guide as soon as possible!
Thanks in advance for you kindness and for your help!
Mary

> Date: Fri, 13 Feb 2009 12:11:40 -0500
> Subject: Re: [vtkusers] tubular structure
> From: dave.demarle at kitware.com
> To: edsb at hotmail.it
> CC: vtkusers at vtk.org
> 
> The tube filter takes in a set of points in space and a data array
> which contains values for each point (defined as either a scalar or
> vector) that determine the radius at each point.
> 
> You define that structure be creating a vtk_polydata, filling in the
> points via SetPoints, and filling in the values via
> GetPointData->SetScalars() or GetPointData->SetVectors().
> 
> Set that polydata as input to the tubefilter and call the filter's
> SetVaryRadius*() method to choose either the scalar array or vector
> array.
> 
> If you define your vector array to be orthogonal to the centroidal
> axis and have a magnitude corresponding to your radius, your should be
> able to do what you want.
> 
> On Tue, Feb 3, 2009 at 5:17 AM, EDSB EDSB <edsb at hotmail.it> wrote:
> > Hi there,
> > I am very new to VTK and I am using it by its Phyton wrapper. I would like
> > to create a tubular structure and I want to put as input
> > the radius and the centroidal axis (that is a spline).
> > Do I have to use the vtkTubeFilter,isn't it? Where can I inupt my spline?
> > Could you help me with an example?
> > Thank a lot for your help!
> > Mary
> >
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> 
> 
> 
> -- 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109

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