[vtkusers] Animation of multiple input files in VTK

[Tijmen Klein]

This is what I do. I set up the whole scene, load in all the different
readers, and connect the first reader to the vtkMarchingCubes. Then I use a
timer that calls an update function every second. This update function sets
the inputconnection of the vtkMarchingCubes to the current reader
(contours->setInputConnection(reader[current]->getOutputPort()). This is
working, but results in small (but very noticable) hickups in the
interaction. I think this is because the isosurfaces have to be
re-calculated every time. That's why I think that I will need an array of
vtkMarchingCubes too.

Tijmen

On Wed, Jul 6, 2011 at 11:02 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> You should update your reader only from a callback function once you
> have your scene/camera/etc set up...
>
> Dominik
>
> On Wed, Jul 6, 2011 at 10:51 AM, Tijmen Klein <T.R.Klein at student.rug.nl>
> wrote:
> > Thank you for the reply. First of all, I'm not trying to export a
> animation;
> > it should be realtime and allowing the user to navigate the scene.
> >
> > I'm currently applying the fist technique (update the reader in a loop).
> > Technically this works fine, but it is really slow and also blocks the
> mean
> > thread of the program (the program simply freezes when switching between
> 2
> > frames). A possible solution that I came up with is the following: create
> N
> > pipelines (up to the mapper), where N is the number of frames. This mean
> I
> > can load the data first, create the isosurfaces and then based on the
> > current time let the actor point to the corresponding mapper. This would
> > mean that all the calculations are already completed.
> >
> > Is this a viable solution? It feels a bit hack-ish to do it like this.
> >
> > Tijmen
> >
> > On Tue, Jul 5, 2011 at 4:00 PM, Dominik Szczerba <dominik at itis.ethz.ch>
> > wrote:
> >>
> >> There are a few possibilities. The simplest would be to update the
> >> reader in a loop and dumping screen renderings. More sophisticated
> >> would be to import them first into a temporal dataset and then request
> >> a specific time value.
> >>
> >> Dominik
> >>
> >> On Tue, Jul 5, 2011 at 2:57 PM, Tijmen Klein <T.R.Klein at student.rug.nl>
> >> wrote:
> >> > I'm trying to animate multiple input files. These files are in the
> >> > legacy
> >> > VTK format (.vtk), and named filename[x].vtk, where [x] is an integer.
> A
> >> > contourfilter is used to generate isosurfaces, and these isosurfaces
> >> > should
> >> > be animated.
> >> >
> >> > This is behaviour that is quite easy to achieve in Paraview (open the
> >> > files,
> >> > apply contour filter, choose a frame or click play). How can something
> >> > similar be achieved in VTK? It should be possible to create a
> >> > time-dependent
> >> > animation, but also manually set the current frame. I thought of
> >> > creating
> >> > multiple InputReaders, and have the 'current' reader's outputport
> >> > connected
> >> > to the input port of the contour filter. But I think this would not be
> >> > very
> >> > efficient, since it's not possible to cache the results in this way.
> >> > This
> >> > would mean that all the calculations happen again when the animations
> >> > restarts from frame 1. What would be a better solution?
> >> >
> >> > Cheers,
> >> > Tijmen
> >> >
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