[vtkusers] How to use 'vtkCurvatures' class?

[Amy Squillacote]

Add a vtkGeometryFilter between vtkThreshold and vtkPolyDataMapper OR 
use a vtkDataSetMapper instead of the vtkPolyDataMapper (in which case 
vtkGeometryFilter is unneeded).

- Amy

B. C. wrote:
> 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
>
>
>               
>
>
> __________________________________________________
> Do You Yahoo!?
> En finir avec le spam? Yahoo! Mail vous offre la meilleure protection 
> possible contre les messages non sollicités
> http://mail.yahoo.fr Yahoo! Mail 

-- 
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