Re: [vmtk-users] bifurcation plane

[Luca A. <luc...@gm...>]

Hi YiQiang,
 I don't think this is what happens: you only get one value per GroupId with the vmtkbranchgeometry script,
while with vmtkcenterlinegeometry you get a curvature value for each point on each centerline.
vmtkbranchgeometry looks at all centerlines tracts in a group and averages their curvature value.

Luca


On May 8, 2013, at 4:48 AM, qiang zeng wrote:

> bifurcation plane is work well.
>  
> another problem, when I caculate the curvature using the following script "vmtkcenterlinegeometry -ifile foo_cl.vtp -smoothing 1 -ofile foo_clgm.vtp", I just get the one curvature value for every GroupIds. but in generally, the curve for every GroupIds has different points (point1, point2,...) and every point in curve has a curvature value respectively.
> So how to understand this approach considering one curvature value as curvature value of entire GroupIds?
>  
> YiQiang  
> --- 13年5月7日，周二, Luca Antiga <luc...@gm...> 写道：
> 
> 发件人: Luca Antiga <luc...@gm...>
> 主题: Re: [vmtk-users] bifurcation plane
> 收件人: "qiang zeng" <zen...@ya...>
> 抄送: vmt...@li...
> 日期: 2013年5月7日,周二,下午2:40
> 
> Hi YiQiang,
>  point1 and point2 are any two points on the plane away from the origin.
> You could do
> point1 = origin + upnormal
> point2 = origin + normal x upnormal
> where x indicates the cross product.
> 
> Luca
> 
> On 07/mag/2013, at 07:39, qiang zeng <zen...@ya...> wrote:
> 
>> Usig the command line:
>>  
>> vmtkbranchextractor -ifile foo_cl.vtp -radiusarray@ MaximumInscribedSphereRadius --pipe
>> vmtkbifurcationreferencesystems -ofile foo_rs.dat
>>  
>> I get the one point and two vectors, then I fill the coordinate into the Paraview (point -> Origin, Normal -> Point1 and Upnormal -> Point2) ?
>> Best
>> YiQiang
>> 
>> --- 13年5月6日，周一, Luca Antiga <luc...@gm...> 写道：
>> 
>> 发件人: Luca Antiga <luc...@gm...>
>> 主题: Re: [vmtk-users] bifurcation plane
>> 收件人: "qiang zeng" <zen...@ya...>
>> 抄送: vmt...@li...
>> 日期: 2013年5月6日,周一,下午8:54
>> 
>> Hi YiQiang,
>>  the figure you attached was created in Paraview using the origin and normal of the plane
>> as computed with vmtk (you can output them in plain text using a .dat file format) to specify the plane 
>> in Paraview (Sources->Plane). It works well if the number of figures you create is small.
>> 
>> If you need to create the visualization automatically you'll need to write VTK code and use the
>> vtkPlaneSource class to create the plane.
>> The class: http://www.vtk.org/doc/nightly/html/classvtkPlaneSource.html
>> Examples: 
>> http://www.vtk.org/doc/nightly/html/c2_vtk_e_5.html#c2_vtk_e_vtkPlaneSource
>> http://www.vtk.org/doc/nightly/html/c2_vtk_t_15.html#c2_vtk_t_vtkPlaneSource
>> 
>> Best,
>> 
>> Luca
>> 
>> 
>> On May 6, 2013, at 9:40 AM, qiang zeng wrote:
>> 
>>> Hi all,
>>> When I am using VMTK, I want to display the bifurcation plane (the view is like aneurysm bifurcation plane, as an attachment "bifurcation plane.jpg").
>>> Does anyone know a way to do this?
>>> Best,
>>> YiQiang
>>> <bifurcation plane.jpg>------------------------------------------------------------------------------
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