[vtkusers] How to extract the geometry a small list of points in the whole vtkPolyData ??? Please Help !!!!

[Bruno da Silva de Oliveira]

(keep the conversation in the vtkusers mailing list, so it can help 
other users in the future)

Hi,

a vtkUnstructuredGrid is the most generic grid type, it will support any 
type of cell (including those supported by polydata), so you will have 
no problems. To render a vtkUnstructuredGrid, use a vtkDataSetMapper.

HTH,

Deepak Roy wrote:

> hello bruno,
>  
> thanks for the reply.
>  
> But vtkThreshold seems to return a vtkUnstructuredGrid.......not a 
> vtkPolyData.......how do i convert it to vtkPolyData.
>  
> I am afraid if this difference in format would create problems.
>  
> Please reply.
>  
> Thanks in advance.
>  
> Bye
>  
> Deepak
>
> */Bruno da Silva de Oliveira <bruno at esss.com.br>/* wrote:
>
>     Try to use vtkImplicitDataSet to generate a known value inside you
>     vtkPolyData of the human body (say, 0) and assign a different
>     value for
>     the points lying "outside" of the vtkPolyData with the nose. This
>     way,
>     you can use vtkThreshold to extract the desired data.
>
>     []s,
>
>     Deepa k Roy wrote:
>
>     > hello,
>     >
>     > I have an open surface in the form of a vtkPolyData.
>     >
>     > Now my algorithm gives a list of connected points in the whole
>     model.
>     >
>     > For example, if u consider the model of a human body, and say my
>     > algorithm gives the list of all points on the nose in the form of
>     > another vtkPolyData
>     >
>     > Now i want to use these list of points to extract the nose from the
>     > whole vtkPolyData model of the human body.
>     >
>     > One thing to note, the geometry corresponding to the list of
>     points,
>     > will be connected , so no need to worry in that sense.
>     >
>     > Can anyone tell what filters of VTK i can use to achieve this
>     task ?
>     > Given the list of points the filter should give me the
>     corresponding
>     > geometry extracted from the whole model. It should pull out all the
>     > cells corresponding to these points.
>     >
>     > Can vtkClipPolyData do this ?
>     >
>     > I can easily create a scalar array, with label for each point if
>     it is
>     > inside or ouside my list of points. Will this be useful. OR is
>     there
>     > anyother way ?
>     >
>     > Please help Me !!!!!
>     >
>     > Bye
>     >
>     > Deepak
>     >
>     >
>     >
>     >
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>     -- 
>     Bruno da Silva de Oliveira
>     bruno at esss.com.br
>     ESSS - Engineering Simulation and Scientific Software
>     http://www.esss.com.br
>
>
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-- 
Bruno da Silva de Oliveira
bruno at esss.com.br
ESSS - Engineering Simulation and Scientific Software
http://www.esss.com.br