[vtkusers] problems with transient unstructured volume rendering

[Dominik Szczerba]

Hmmm all I am getting at the output is ONE cell (hexa 8 points) with 
several scalars but all of them constant in time.

I think I will need something a little more realistic to demonstrate the 
problem.

Or at least a small transient ImageData that can be triangulated.

Dominik

David E DeMarle wrote:
> That particular filter has only four parameters, produce data at
> discrete locations or analytically across the temporal domain, grow
> (vary number of cells or not), and x and y amplitude for it to move
> across over time.
> 
> It produces at most 5 cells I think, so you will have to write some
> code if the bug is only exposed by higher resolution data. The point
> was to make something small and predictable to test vtk's support for
> time varying data.
> 
> More details about time in VTK can be found here
> http://www.vtk.org/Wiki/VTK/Time_Support
> 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
> 
> 
> 
> On Tue, Dec 15, 2009 at 3:33 PM, Dominik Szczerba <dominik at itis.ethz.ch> wrote:
>> I will be happy to.
>>
>> While I download and compile CVS, would you kindly post an example how to
>> generate such a transient dataset (at a desired resolution for inaccurate
>> but fast rendering)?
>>
>> Dominik
>>
>> David E DeMarle wrote:
>>> In CVS, time source produces an unstrucured grid that changes over
>>> time. Can you reproduce the problem with that?
>>>
>>> David E DeMarle
>>> Kitware, Inc.
>>> R&D Engineer
>>> 28 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-371-3971 x109
>>>
>>>
>>>
>>> On Tue, Dec 15, 2009 at 3:25 PM, Dominik Szczerba <dominik at itis.ethz.ch>
>>> wrote:
>>>> I am quite happy with static unstructured volume rendering.
>>>>
>>>> The problems arise when I request subsequent timesteps:
>>>>
>>>>       while time<=timeEnd:
>>>>               executive = reader.GetExecutive()
>>>>               executive.SetUpdateTimeStep(0,time)
>>>>               reader.Modified()
>>>>               window.Render()
>>>>
>>>>
>>>> This results in changing but wrong colors in my volume. Don't know
>>>> exactly
>>>> what is rendered, but it is certainly different from rendering the
>>>> subsequent timestep from scratch. The situation is remedied with the
>>>> following code:
>>>>
>>>>       while time<=timeEnd:
>>>>               executive = reader.GetExecutive()
>>>>               executive.SetUpdateTimeStep(0,time)
>>>>               reader.Modified()
>>>>               renderer.RemoveVolume(volume)
>>>>               volume = vtkVolume()
>>>>               volume.SetMapper(volumeMapper)
>>>>               volume.SetProperty(volumeProperty)
>>>>               renderer.AddVolume(volume)
>>>>               window.Render()
>>>>
>>>> Looks like something is not reset, but my color/transfer functions are
>>>> static (not changing with the changing scalar ranges).
>>>>
>>>> I could just shrug and go on, but this does not look fine to me so I
>>>> thought
>>>> I'd better ask if it is not a problem somewhere in VTK that should be
>>>> reported.
>>>>
>>>> Dominik
>>>>
>>>> PS. Following the great example of David D. I wanted to set up a wiki
>>>> example, but unfortunately I was unable to find a small (transient
>>>> unstructured) example dataset or an example code to generate one.
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>