[vtkusers] How to use 'vtkCurvatures' class?

[B. C.]

Hi Amy,
when i do what you told me, i have this error:
error C2664: 'SetInput' : cannot convert parameter 1 from 'class vtkUnstructuredGrid *' to 'class vtkPolyData'
for the code line 'maxMapper->SetInput(thresh->GetOutput());'
It should be something else to add before this. Can you help me?


--- En date de : Ven 17.10.08, Amy Squillacote <ahs at cfdrc.com> a écrit :

De: Amy Squillacote <ahs at cfdrc.com>
Objet: Re: [vtkusers] How to use 'vtkCurvatures' class?
À: butterfly.1688 at yahoo.fr
Cc: vtkusers at vtk.org
Date: Vendredi 17 Octobre 2008, 20h12

Put the vtkThreshold code after you set up vtkCurvatures (just below 
your call to curve->Update()). Then change the input to maxMapper from 
"curve->GetOutput()" to "thresh->GetOutput()".

- Amy

B. C. wrote:
> Thank you Amy.
> I post you the code i used:
>  
> vtkCurvatures *curve = vtkCurvatures::New();
> curve->SetInput(cleaner->GetOutput());
> curve->SetCurvatureTypeToMaximum();
> curve->Update();
>  
> vtkPolyDataMapper *maxMapper = vtkPolyDataMapper::New();
> maxMapper->SetInput(curve->GetOutput());
>  
> vtkActor *maxCurve = vtkActor::New();
> maxCurve->SetMapper(maxMapper);
> maxCurve->SetPosition(0.0,0.0,0.0);
> myRender->AddActor(maxCurve);
> myRenderWindow->Render();
>  
> Please, tell me where to add the code you sent to me to display the 
> maximum curvatures>0.5
>  
> Thank you for your help!!!
>
>
> --- En date de : *Ven 17.10.08, Amy Squillacote /<ahs at cfdrc.com>/* a

> écrit :
>
>     De: Amy Squillacote <ahs at cfdrc.com>
>     Objet: Re: [vtkusers] How to use 'vtkCurvatures' class?
>     À: butterfly.1688 at yahoo.fr
>     Cc: vtkusers at vtk.org
>     Date: Vendredi 17 Octobre 2008, 19h41
>
>     You'll want to use vtkCurvatures with curvature type set to
maximum. 
>     Then pass the output of that filter to a vtkThreshold, using the 
>     ThresholdByUpper method to indicate the values to keep. Example c++
code 
>     is shown below.
>
>     vtkCurvatures *curv = vtkCurvatures::New();
>     curv->SetCurvatureTypeToMaximum();
>
>     vtkThreshold *thresh = vtkThreshold::New();
>     thresh->SetInputConnection(curv->GetOutputPort());
>     thresh->ThresholdByUpper(0.5); // using the example value you
provided.
>
>     Online documentation for vtkCurvatures is here: 
>     http://www.vtk.org/doc/nightly/html/classvtkCurvatures.html.
>     Online documentation for vtkThreshold is here: 
>     http://www.vtk.org/doc/nightly/html/classvtkThreshold.html.
>
>     - Amy
>
>     B. C. wrote:
>     > Please, i need your help to finish my work!!!
>     > I use 'vtkCurvatures' to compute curvatures at each point
of my 
>     > polydata structure.
>     > I want to save only the Maximum curvatures and display only those

>     > which are > some_value (0.5 for example).
>     > Can someone tell me how to do this?
>     > Please heeeeeeeeelp!!!
>     >
>     >
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>     -- 
>     Amy Squillacote                    Phone: (256) 726-4839
>     Computer Scientist                 Fax: (256) 726-4806
>     CFD Research Corporation           Web: http://www.cfdrc.com
>     215 Wynn Drive, Suite 501
>     Huntsville, AL  35805
>
>
>               
>
>
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-- 
Amy Squillacote                    Phone: (256) 726-4839
Computer Scientist                 Fax: (256) 726-4806
CFD Research Corporation           Web: http://www.cfdrc.com
215 Wynn Drive, Suite 501
Huntsville, AL  35805




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