[vtkusers] problems with transient unstructured volume rendering

[Dominik Szczerba]

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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>