[Paraview] Animation with sudden large intervals between consecutive frames

[Utkarsh Ayachit]

Tom,

I wonder if caching is causing these issues. Are you using the
ParaView GUI or a Python script? If  the GUI, can you disable caching
(uncheck "Cache Geometry" from the "Animation" page in the "Settings"
dialog.

Utkarsh

On Mon, Jan 14, 2013 at 5:50 AM, Tom Fahner <tom.fahner at gmail.com> wrote:
> Dear all,
>
> For some reason I noticed that ParaView has some large intervals between
> writing a PNG for consecutive frames of an animation. Normally there is
> about one minute between the timestamp of two PNGs, but sometimes there is
> suddendly a gap of 8 hours:
>
>  141K Jan 13 15:56 New_Volume_.0118.png
>  141K Jan 13 15:58 New_Volume_.0119.png
>  139K Jan 13 15:59 New_Volume_.0120.png
>  139K Jan 13 16:00 New_Volume_.0121.png
>  138K Jan 14 00:34 New_Volume_.0122.png
>  139K Jan 14 00:35 New_Volume_.0123.png
>  139K Jan 14 00:36 New_Volume_.0124.png
>
> There are multiple occasions where these large intervals happen but this
> does not happen at a regular interval of the animation. There does seem to
> be a relation with the amount of memory that is used, since there is a
> sudden decrease in memory used right after "Jan 14 00:34". Below I will
> describe my animation and setup. I hope anyone can give an explanation for
> the behavior.
>
> During the weekend I have created an animation of a mixing tank using volume
> rendering of the concentration of some chemicals in the tank. It is a
> reasonably large CFD simulation performed with OpenFOAM. There are about 15
> million cells (tetrahedrals and prismatic layer), but not extremely large. I
> saved the concentration every 0.25 seconds for a 120s simulation. We have
> ParaView 3.98.0 installed on this machine and it was the only program
> running at the time. I have made the animation with ffmpeg after ParaView
> made the frames as consecutive pngs. Besides the volume rendering of the
> concentration, the walls of the tank where shown with a fixed opacity of 0.3
> and the internal structure (some rotors and baffles) where present as well.
> Although the simulation use the MRF concept, I did mimick the rotation of
> the rotors using the transform filter. Using the "cool to warm" preset for
> visualization I could nicely set the opacity to 0 when the concentration was
> in the allowed range and it showed red in case of too high concentration, of
> blue when too low. The resulting animation is satisfactory, I just wonder
> what can be done to make sure these large intervals between writing images
> do not happen.
>
> Hope someone can help, if you need more information, please let me know.
>
> Regards,
> Tom
>
> --
> T.C. Fahner
> e: tom.fahner at gmail.com
>
>
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