multiple vtk files to animation ?

[MAT-AI-OS]

hello,
I'm new in BVtk. I am trying the last days to make an animation of several *.vtk legacy files.

I can present one mesh. I read https://bvtknodes.readthedocs.io/en/latest/BVTKNodes.html#time-selector
and my files are named in the exact same name except the number than represents a time step.

I understood that Use Scene Time should be set to Off (how do I turn it off ? ) and Global Time Keeper Node should not be used at all in my case.
I ran out of ideas to try. I post the nodes that work for one file.

Do you have any ideas which nodes i should use?
I tried vtkPolyDataReader as mention, but it doesn't read the file.

Thanks in advance,
Matthew

[tkeskita]

Hi,

Good to know that vtkDataSetReader reads the data for this case (you seem to have unstructured grid data). I haven't used that reader, hope it works with Time Selector! You can also try vtkUnstructuredGridReader directly.

You need to add Time Selector node between the reader and Color Mapper nodes. Use Scene Time option is located on the Time Selector node. When it is enabled, you can use Blender Timeline to change between time points, so keep it enabled. Hope this helps!

[MAT-AI-OS]

Thanks a lot.! It does work :)
Time Selector selects the right filename and and it does work with vtkDataSetReader.

I used Blender Timeline (with Scene Time enabled) and by constantly re-pressing 'Force Upstream Update' I kinda had an animation played on 3Dviewport.

In Color Mapper i disabled Auto Range -so that differences between files is viewable- and enabled Generate Scalar Bar -but I get no colors in Scalar Bar.

Do you know how to make the final node auto-update for each keyframe?

I suppose after that, I can work with blender animation, camera/ rendering to make a exportable animation.
Any suggestion is appreciated.

[MAT-AI-OS]

Quite strange that in my test blender file (the one with above screenshots) I don't get animation while keyframe is changing on timeline.
But on the main file I use, where I use also Sverchok, I get animation.! I am wondering why.

I am still trying to get colors on Scalar Bar.
If you can guess why, I will be happy to test it. Thanks in advance!

[tkeskita]

Hi,

good that vtkDataSetReader works! Since you're doing a somewhat involved animation, please read carefully through the docs:

• Enable "Update All Automatically" Update Mode in Inspect Panel. This will cause VTK pipeline to auto-update upon frame changes.
• Scalar Bar is not working well, I suggest not to use it.
• What property are you animating with keyframes? If you try to animate a BVTK node property, you need to use Global Time Keeper node. I think normal Blender properties should be animated with keyframes without Global Time Keeper.