[Paraview] Re : Re : How to update GUI/paraview when data and time change in a reader ?

[Biddiscombe, John A.]

Apologies, reread the mail after I sent it and I see that you did set TIME_STEPS. Changing UPDATE_TIME_STEPS  can be done in request update extent, but not request information. One usually does this when modifying time as it passes through the pipeline. I don’t think you want to do this. when you change the TIME_STEPS, paraview should refresh it’s internal knowledge of time and change the requested time to something sensible. if this is not happening, then


JB.

From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Biddiscombe, John A.
Sent: 25 November 2010 16:13
To: R M; paraview at paraview.org
Subject: Re: [Paraview] Re : Re : How to update GUI/paraview when data and time change in a reader ?

UPDATE_TIME STEPS is what is being requested from you. Are you sure yoy shouldn’t be setting

    outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(),
      &this->TimeStepValues[0],
      static_cast<int>(this->TimeStepValues.size()));

or similar in your request information? When this changes, the time keeper should refresh, and then the GUI ought to change the time it asks for (assuming there’s some way it can know the correct time).

In request data, you should only change the time on the data itself and leave the output information alone.

JB


From: R M [mailto:mlokida at yahoo.fr]
Sent: 25 November 2010 15:33
To: Biddiscombe, John A.; paraview at paraview.org
Subject: Re : [Paraview] Re : How to update GUI/paraview when data and time change in a reader ?

I though that the fact that using in RequestInfo :

outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(), &timedata[0], numTimeData);
outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_RANGE(), timeRange, 2);
outInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS(), &myRequestedTime, 1);

and using in RequestData:

int tsLength = outInfo->Length(vtkStreamingDemandDrivenPipeline::TIME_STEPS());
double* steps = outInfo->Get(vtkStreamingDemandDrivenPipeline::TIME_STEPS());
double *requestedTimeSteps = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS());

would make the job.

But In my tests, as if outinfo is the same object (same address), the use of outInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS(), &myRequestedTime, 1); in RequestInfo doen't set my requestedTime but keep the old requested time.  Is-it Normal ?
________________________________
De : "Biddiscombe, John A." <biddisco at cscs.ch>
À : R M <mlokida at yahoo.fr>; "paraview at paraview.org" <paraview at paraview.org>
Envoyé le : Jeu 25 novembre 2010, 15h 18min 42s
Objet : RE: [Paraview] Re : How to update GUI/paraview when data and time change in a reader ?

If the time values change, then the view needs to be told to update with a new ‘time’ – you’ll need to force an update with something similar to
vtkPVView::SetViewTime
(You’ll also want to make sure the timekeeper refreshes itself when the reader updates – to ensure that paraview has the coorect times in it’s internal state).

JB



From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of R M
Sent: 25 November 2010 14:54
To: paraview at paraview.org
Subject: [Paraview] Re : How to update GUI/paraview when data and time change in a reader ?

So, I use the Modified() method that updates the internal time stamp for the object (from "The VTK User's Guide").
When I have attributes (points attributes  of a  vtkpolydata) with the same time steps, everything is fine and when I switch from one attribute to an other, the requested Time step is ok (because we have the same time steps).
But, when I have attributes with differents time steps (ex: A [1, 5, 10] and B [2, 6, 11]) there is a problem of update.  If I switch from an attribute to an other, the requested time step for the new selected attribute is the requested time step of the previous attribute.

So how can I correctly update  the requested time steps of the vtk pipeline when I updarte time steps and time range of the vtk pipeline ?
________________________________
De : R M <mlokida at yahoo.fr>
À : paraview at paraview.org
Envoyé le : Mer 24 novembre 2010, 14h 49min 36s
Objet : [Paraview] How to update GUI/paraview when data and time change in a reader ?
Hi,

Here’s my problems. I have a reader that load a geometry and some attributes (at the points). These attributes changed in the time and I can select one of them in a combo box (GUI in the reader).
For example, I have 2 attributes «A» and «B».  So In the reader, by default the first attribute is seleted (« A »).  The  selection in the reader GUI makes  the call of a method doing the change of the selected attribute (« A ») and corresponding time values. For time values it looks like this :

vtkDemandDrivenPipeline* ddp = vtkDemandDrivenPipeline::SafeDownCast(this->GetExecutive());
vtkInformationVector* outputVector = ddp->GetOutputInformation();
vtkInformation* outInfo = outputVector->GetInformationObject(0);

outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(), & timeData[0], numTimeData);

double timeRange[2];

timeRange[0] = timeData[0];
timeRange[1] = timData[numTimeData-1];

outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_RANGE(), timeRange, 2);

The problems are the following. When I select «B» and make apply, timevalues corresponding to «B» are set and a new vtkPolyData is made with the corresponding point attribute data of «B» for the given time step. But, in paraview, the mapped variable of the toolbars is not update. «A» is always here (whereas I would like to have «B»).

-> How and where can we say to paraview to update the GUI and have the B appears in the mapped variable of the toolbars ?

Moreover, Paraview has a geometry cache  (Edit/settings /Animation). But when for example atributes «A» and «B» have the same time values and that we have selected all the time step for « A », when we select «B», nothing is done because paraview has cached data for the «A» and for the same time values than «B». So paraview doesn’t need to update beacause it considerer to have data for the requested time step.

-> So, How can I say to Paraview that when a new attribute is selected, it needs to empty it’s cache and load data for requested time ?

Thank you.



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