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Resimulation frames become unreadable half way without any errors shown.

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  • Resimulation frames become unreadable half way without any errors shown.

    Hello all,
    I'm having an issue with Phoenix FD (v41000) inside 3DS Max 2020. I've been doing simulations for a project with the intention of resimulating the frames to get a higher resolution grid for rendering. Every single time I have started the resimulation everything will go fine until one point where every newly created frame becomes unreadable, without Max/Phoenix showing any errors, it even keeps simulating normally and frames keep being created (size is about 14GB per frame when this happens), I can also see the CPU working hard non-stop.
    All the proper output channels are selected, my drives have space (using PCIe SSDs), and also my PC has enough free memory every time this happens (128GB total, when Resimulation is going memory never goes higher than 80-90GB used... not all used by Max). The "Max Memory" settings on Phoenix are set to 95%.
    The only thing I see unusual is in the "PhoenixFDFire" settings; the little box where it says "Cache File Content" becomes empty at the same time the frames become unreadable. At this point, if I uncheck the "Grid Resimulation" I can see the original frames can load fine together with their "Cache File Content" info, this makes me think that the source is fine... I have repeated this same process 4-5 times already on difference disks and get the same problem at some point, never past the 200 frames (need 500+ in my final render). Also have tried this using Thinkbox Deadline on another PC and also get the same problem. My scene is very simple and the only keyframes I have are set on the emitter to control the amount of smoke that is emitted.
    Any help is immensely appreciated.
    Attached Files
    Last edited by zzzpeak; 27-04-2020, 06:52 PM.

  • #2
    Hmm, we have a known issue where if the compressed grid data goes over 8GB, the caches will become unreadable. Sounds like the same thing. I will bump its priority and start working on it over the next few days, but meanwhile can you show me the Output and Resimulation rollouts of your Simulator - maybe there are some channels that you can get rid of so you can work before there is a fix.
    Svetlin Nikolov, Ex Phoenix team lead

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    • #3
      Ok, yeah seems like the same thing. Many thanks for the help The images with the settings are below. Click image for larger version  Name:	phoenixRollouts001.PNG Views:	1 Size:	37.8 KB ID:	1068276

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      • #4
        Oh, so I see two things that might go away unless you really need them:
        - Advection Origin in the Output rollout - you might need this if you intend to change the play speed of the resimulation after you have already resimulated it, using the Precise Tracing method from the Input rollout. Otherwise, you can turn it off.
        - No-Export channels - unless you intend to run a resimulation over the resimulation caches, which is a very rare scenario, you could add the Wavelet channel there;

        Also, in case you are not going to render with motion blur or retime the already completed resimulaiton, you could turn off Velocity from the Output and also from the No-Export Channels.
        Svetlin Nikolov, Ex Phoenix team lead

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        • #5
          Ok, awesome. Thanks for the tips, much appreciated. Will try it.

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          • #6
            Hey,

            Just wanted to let you know that if you get a nightly build from today, Phoenix will be able to write and read correctly cache files over 8GB.

            Here is how to get a nightly build - https://forums.chaosgroup.com/forum/...nightly-builds

            Cheers!
            Georgi Zhekov
            Phoenix Product Manager
            Chaos

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            • #7
              Thank you!

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