[vtkusers] Fwd: Re:AW: vtkContourFilter notworkingonvtkStructuredGrid
Sebastian Gatzka
sebastian.gatzka at stud.tu-darmstadt.de
Fri Mar 12 06:05:42 EST 2010
I have checked it maybe a hundrert times.
I have tried different ranges, different numbers of surfaces,
GenerateValues(), SetValue() even different colors (in case it collides
with the background color).
And yes maybe my data has some problem - but I have absolutley NO idea
what kind of.
The scalar data is properly displayed on a cutting plane, but I can't
create iso surfaces.
Am 12.03.2010 11:59, schrieb Rakesh Patil:
>
> Try once again... Check code properly.. It should work.. else your
> data may be having some problem..
>
> Thanks
>
> Regards
> Rakesh Patil
>
>
> ---------- Original message ----------
> From:Sebastian Gatzka< sebastian.gatzka at stud.tu-darmstadt.de >
> Date: 12 Mar 10 15:57:21
> Subject: Re: [vtkusers] Fwd: Re:AW: vtkContourFilter
> notworkingonvtkStructuredGrid
> To: vtkusers
>
> 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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