[vtkusers] problems with transient unstructured volume rendering

[David E DeMarle]

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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