[Paraview] UPDATE_TIME_INDEX not part of Paraview 2.6

[Mike Jackson]

Thanks for the code. I downloaded your OpenDX reader to get an idea  
of the context. I have updated my code and things seem to work now.  
The only problem that I am having is the "Time Step" slider is not  
correctly updated when I open my file, it always defaults to 0->100  
timesteps, regardless of what is in the file.

   In my client side xml I have the following:

	<Module name="PrdsDislocationReader"
           root_name="PrdsDislocationReader"
           output="vtkUnstructuredGrid"
           module_type="Reader"
           extensions=".dat .disl"
           file_description="Paradis Dislocation Data">

     <Source class="vtkPrdsDislocationReader"/>

     <Scale property="TimeStep"
            label="Time step"
            trace_name="TimeStep"
            keeps_timesteps="1"
            help="Set the current timestep."/>
	</Module>

and in my server manager file I have:

	<SourceProxy name="PrdsDislocationReader"  
class="vtkPrdsDislocationReader">
      <StringVectorProperty
         name="FileName"
         command="SetFileName"
         number_of_elements="1">
         <StringListDomain name="files"/>
      </StringVectorProperty>

      <IntVectorProperty
         name="TimeStep"
         command="SetTimeStep"
         number_of_elements="1"
         animateable="1"
         default_values="0"
         information_property="TimestepValues">

        <IntRangeDomain name="range">
           <RequiredProperties>
              <Property name="TimeStepRangeInfo" function="Range"/>
           </RequiredProperties>
        </IntRangeDomain>
      </IntVectorProperty>

      <IntVectorProperty
         name="TimeStepRangeInfo"
         command="GetTimeStepRange"
         information_only="1">
         <SimpleIntInformationHelper/>
      </IntVectorProperty>



      <DoubleVectorProperty
         name="TimestepValues"
         information_only="1">
         <TimeStepsInformationHelper/>
      </DoubleVectorProperty>
    <!-- End ParadisReader -->
    </SourceProxy>

I have tried to mimic the ExodusReader code where I can but nothing  
seems to work. Does anyone have any ideas what I need to set/over- 
ride or implement? Maybe something from the superclass  
(vtkPolyDataAlgorithm) maybe?

Thanks for any help
-- 
Mike Jackson   Senior Research Engineer
Innovative Management & Technology Services


On Feb 7, 2007, at 3:14 AM, John Biddiscombe wrote:

> Mike, The time handling has changed a bit recently. TIME_INDEX is  
> no longer supported (partly because you may have 100 time steps of  
> data with step number 34 missing, if step 35 is requested, do they  
> want the 35th of the data you actually have, or the 35th of the  
> data you would have if the steps were all present). Instead, use a  
> time value which is real and represents the actual time.(this also  
> allows source which can produce a continuum of time values to be  
> accessed)
>
> To get things right, try this
>
> //-------------------------------------------------------------------- 
> --------
>
> In RequestInformation, make sure you export the steps you can  
> produce (often just 1.0, 2.0, 3.0.....etc)
>
>  outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(),
>               &this->TimeStepValues[0], this->TimeStepValues.size());
>
>    where you may have std::vector<double> TimeStepValues - with the  
> values pushed back when the file is opened
>
> //-------------------------------------------------------------------- 
> --------
>
> In RequestData, check to see which time step was requested, this  
> usually will be set in the GUI via SetTimeStep, but might be passed  
> into the filter from downstream, if another filter is requesting  
> data from a particular step
>
>  this->ActualTimeStep = this->TimeStep; // set by the gui, but we  
> will override this if the pipeline requested another
>
>  if (outInfo->Has 
> (vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS()))
>    {
>    double requestedTimeValue = outInfo->Get 
> (vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS())[0];
>    // this is overkill, I use it to ensure that if a time value  
> which is slightly out is requested
>    // then the correct one is fetched
>    this->ActualTimeStep = vtkstd::find_if(
>      this->TimeStepValues.begin(),
>      this->TimeStepValues.end(),
>      vtkstd::bind2nd( WithinTolerance( ), requestedTimeValue ))
>      - this->TimeStepValues.begin();
>    this->ActualTimeStep = this->ActualTimeStep + this->TimeStepRange 
> [0];
>    doOutput->GetInformation()->Set(vtkDataObject::DATA_TIME_STEPS 
> (), &requestedTimeValue, 1);
>    CSCSOutputMacro(<<"Got a timestep request from downstream t= "  
> << requestedTimeValue << " Step : " << this->ActualTimeStep);
>    }
>  else
>    {
>    double timevalue[1];
>    timevalue[0] = this->TimeStepValues[this->ActualTimeStep-this- 
> >TimeStepRange[0]];
>    CSCSOutputMacro(<<"Using manually set t= " << timevalue[0] << "  
> Step : " << this->ActualTimeStep);
>    doOutput->GetInformation()->Set(vtkDataObject::DATA_TIME_STEPS 
> (), &timevalue[0], 1);
>    }
>
> //-------------------------------------------------------------------- 
> --------
> note that
>
> class WithinTolerance: public std::binary_function<double, double,  
> bool>
> {
> public:
>    result_type operator()(first_argument_type a,  
> second_argument_type b) const
>    {
>      bool result = (fabs(a-b)<=(a*1E-6));
>      return (result_type)result;
>    }
> };
>
> if you want to see a filter that uses the above code and works  
> well, look here
> https://svn.cscs.ch/vtkContrib/trunk/vtkCSCS/vtkOpenDX/
> for my openDX reader which is the most simple one I've made that  
> uses the above code.
>
> JB
>> I was trying to recompile my ParaView modules and I get the error:
>>
>> /Users/mjackson/Task_4/Workspace/PVDislocation/ 
>> vtkPrdsDislocationReader.cpp:80: error: 'UPDATE_TIME_INDEX' is not  
>> a member of 'vtkStreamingDemandDrivenPipeline'
>>
>> The offending line is:
>>   outInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_INDEX 
>> (), this->GetTimeStep() );
>>
>> This used to work in ParaView 2.4.4 and I vaguely remember that  
>> time support was being changed in PV 2.6. Could someone explain  
>> what I should be using now?
>>
>> I have written a custom ParaView reader module for our file  
>> format. I need Time Support and I was successfully using this code  
>> in PV 2.4.
>>
>> Thanks
>> --Mike Jackson   Senior Research Engineer
>> Innovative Management & Technology Services
>>
>>
>>
>> _______________________________________________
>> ParaView mailing list
>> ParaView at paraview.org
>> http://www.paraview.org/mailman/listinfo/paraview
>
>
> -- 
> John Biddiscombe,                            email:biddisco @ cscs.ch
> http://www.cscs.ch/about/BJohn.php
> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
>
>