Re: [vmtk-users] vtkvmtkPolyDataCenterlines class

[Luca A. <an...@ma...>]

Hi David,
  centerline resampling generates centerlines with an even spacing  
between points. The default value is the distance between points in  
physical units. The parent class is the classical  
vtkPolyDataAlgorithm, you can use either SetInput or  
SetInputConnection, analogously to most VTK classes.
Centerline projection projects data defined on centerlines (like  
scalars or vectors) onto the surface. It uses radius because it's a  
more robust way of locating what centerline point every surface points  
corresponds to. It uses closest point to the tube surface, instead of  
Euclidean distance to the centerline, it's quite robust. There's no  
direction - direction-based projections are often rather weak.  
However, if you want to implement one, I can give you directions.
Bye for now


Luca


On Dec 8, 2009, at 9:02 PM, David Welch wrote:

> Hi, all.  I just have a few questions about the Centerlines class.
>
> What does CenterlineResampling do and what is the default value?
> Is there a vtk parent class for Centerlines, ie. can I use  
> SetInputConnection from the vtkPolyDataAlgorithm class on Centerlines?
> What does CenterlineProjection do?  Does it project the centerline  
> onto the vessel?  It uses vessel radius, so I'm skeptical about  
> that... There's no direction (phi angle, something) that I can see  
> to direct that kind of projection.
>
> Cheers,
>
> Dave Welch
> Graduate Student
> Dept. of Biomedical Engineering
> University of Iowa
> Lab: (319) 335-5279
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