[vtkusers] Fwd: Re:AW: vtkContourFilter not workingonvtkStructuredGrid
Sebastian Gatzka
sebastian.gatzka at stud.tu-darmstadt.de
Fri Mar 12 05:27:21 EST 2010
Yes. Of Course I tried that.
Nothing changes.
Am 12.03.2010 11:19, schrieb Rakesh Patil:
> Hi,
>
> Have you tried implementing what i told you.???
>
> scalarIsoSurface->GenerateValues( 10, sGrid->GetScalarRange() );
>
> this will solve your problem... As i told u before, there is no other
> prob i could figure out other than this.. GenerateValues takes three
> parameters, i.e.
>
> 1. Number of contour lines,
> 2. min. value(of range)
> 3. max value(of range)
>
> It also takes two parameters.. in this case 2nd parameter is double
> array consisting two elements..
>
> Thanks
>
> Regards
> Rakesh Patil
>
>
> ---------- Original message ----------
> From:Sebastian Gatzka< sebastian.gatzka at stud.tu-darmstadt.de >
> Date: 12 Mar 10 15:40:22
> Subject: Re: [vtkusers] Fwd: Re:AW: vtkContourFilter not
> workingonvtkStructuredGrid
> To: vtkusers
>
> Hi again.
>
> Attached you will find the code that should produce the iso
> surface, but displays nothing.
> I even tried to apply the vtkAssignAttribute frinxor at gmail.com
> suggested ...
> Nothing changes.
>
> Hope you will find the mistake.
> Have a nice day.
> Sebastian
>
> Am 10.03.2010 15:50, schrieb Rakesh Patil:
>>
>> Well, i dont think anything is wrong
>>
>> According to this,
>>
>> http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html
>>
>> vtkContourFilter is a filter that takes as input any dataset and
>> generates on output isosurfaces and/or isolines. So that is not a
>> problem..
>>
>> Can u just get you final code what u have coded..??
>>
>> Thanks
>>
>> Regards
>> Rakesh Patil
>>
>>
>> ---------- Original message ----------
>> From:Sebastian Gatzka< sebastian.gatzka at stud.tu-darmstadt.de >
>> Date: 10 Mar 10 17:43:19
>> Subject: [vtkusers] Fwd: Re:AW: vtkContourFilter not working
>> onvtkStructuredGrid
>> To: vtkusers at vtk.org
>>
>> No, this doesn't work out.
>> I put Update()'s at every (possible) object but nothing happens.
>>
>> Even chaning SetValue() and GenerateValues() doesn't change that.
>> So maybe there is something wrong with the data?!
>>
>> I have a structured grid (called sGrid) and the scalar values
>> are defined at the cell centers:
>>
>> sGrid->GetCellData()->SetScalars(T);
>>
>> But I just pass the sGrid to the vtkContourFilter
>>
>> vtkContourFilter *scalarIsoSurface vtkContourFilter::New();
>> scalarIsoSurface->SetInput(sGrid);
>>
>> May this be the problem?
>>
>>
>> -------- Original-Nachricht --------
>> Betreff: Re:AW: [vtkusers] vtkContourFilter not working on
>> vtkStructuredGrid
>> Datum: Sat, 06 Mar 2010 09:34:59 +0530
>> Von: Rakesh Patil <rakeshthp at in.com>
>> Antwort an: Rakesh Patil <rakeshthp at in.com>
>> An: Sebastian Gatzka <sebastian.gatzka at stud.tu-darmstadt.de>
>>
>>
>>
>> Hi Sebastian,
>>
>> I see there is a small mistake over there in your code..
>>
>> As far as my knowledge is concerned,
>>
>> scalarIsoSurface->GenerateValues(0,0.1);
>>
>> This statement should produce error. Coz, according to the
>> documentation given here
>>
>> http://www.vtk.org/doc/release/5.4/html/a00323.html
>>
>> GenerateValues takes two parameters if and only if second
>> parameter is a double array comprising of two elements min
>> and max range.
>>
>> Even if this code executes without any error, then also no
>> output will be produced, because the first argument you are
>> passing is 0. First parameter tells the number of contours to
>> be generated, Second parameter tells within what range these
>> contours should be plotted.
>>
>> What i guess is, either you change it that statement t o
>>
>> scalarIsoSurface->SetValue(0, 0.1);
>>
>> or
>>
>> scalarIsoSurface->GenerateValues( n, sGrid->GetScalarRange() );
>>
>> where n is number of lines you want, say 1, 5, 10, 12...
>> whatever...
>>
>> And then say update..
>>
>> Am i correct David Sir..??
>>
>> Thanks
>>
>> Regards
>>
>> Rakesh Patil
>>
>>
>> ---------- Original message ----------
>> From:"Sebastian Gatzka"<
>> sebastian.gatzka at stud.tu-darmstadt.de >
>> Date: 05 Mar 10 22:50:50
>> Subject: AW: [vtkusers] vtkContourFilter not working on
>> vtkStructuredGrid
>> To: "'Rakesh Patil'"
>>
>> Hm. The ->Update() did not work out.
>>
>> What can be wrong? How can the data be not fed correctly?
>>
>> *Von:* Rakesh Patil [mailto:rakeshthp at in.com]
>> *Gesendet:* Freitag, 5. M¤rz 2010 16:25
>> *An:* David Doria
>> *Cc:* Sebastian Gatzka; vtkusers at vtk.org
>> *Betreff:* Re: [vtkusers] vtkContourFilter not working on
>> vtkStructuredGrid
>>
>>
>> Ya, I had also done the same mistake... I had ommitted
>> that update statement.. By putting that update statement
>> is should definitley work.. (only if data is fed correctly)
>>
>>
>> ---------- Original message ----------
>> From:David Doria< daviddoria+vtk at gmail.com >
>> Date: 05 Mar 10 19:26:03
>> Subject: Re: [vtkusers] vtkContourFilter not working on
>> vtkStructuredGrid
>> To: Sebastian Gatzka
>>
>> On Fri, Mar 5, 2010 at 8:41 AM, Sebastian Gatzka
>> <sebastian.gatzka at stud.tu-darmstadt.de
>> <mailto:sebastian.gatzka at stud.tu-darmstadt.de>> wrote:
>>
>> Hello.
>>
>> I really can't tell why my code is not gernerating the
>> iso-surface.
>> I have a structured grid (sGrid) filled with scalars.
>>
>> I call the contour filter
>>
>> vtkContourFilter *scalarIsoSurface vtkContourFilter::New();
>> scalarIsoSurface->SetInput(sGrid);
>> scalarIsoSurface->GenerateValues(0,0.1);
>>
>> Compute the normal
>>
>> vtkPolyDataNormals *sGridPolyDataNormal
>> vtkPolyDataNormals::New();
>> sGridPolyDataNormal->SetInput(scalarIsoSurface->GetOutput());
>>
>> Put them into a poly data mapper
>>
>> vtkPolyDataMapper *scalarIsoSurfaceMapper
>> vtkPolyDataMapper::New();
>> scalarIsoSurfaceMapper->SetInput(sGridPolyDataNormal->GetOutput());
>>
>> and into an actor
>>
>> vtkActor *scalarIsoSurfaceActor = vtkActor::New();
>> scalarIsoSurfaceActor->SetMapper(scalarIsoSurfaceMapper);
>>
>> which is passed on to the scene
>>
>> ren1->AddActor(scalarIsoSurfaceActor);
>>
>> and NOTHING happens.
>>
>> Any ideas what I have missed, or whats wrong?
>>
>> Sebastian
>>
>> You probably have a call to Render() after the code you
>> sent us, which I believe updates the whole pipeline.
>> Whenever I have something that is totally empty, I go
>> back and put an Update() call on every object that is
>> updatable.
>>
>> scalarIsoSurface->GenerateValues(0,0.1);
>>
>> scalarIsoSurface->Update();
>>
>> before I dig too deep.
>>
>> If that doesn't change anything, try to create a demo
>> involving some simple data (using a vtk*Source if you
>> can, so we can reproduce it without needing your
>> dataset). Then send us the smallest compilable code that
>> demonstrates the problem.
>>
>>
>> Thanks,
>>
>> David
>>
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