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Rendertimes using animation prepass mode

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  • Rendertimes using animation prepass mode

    Hi,

    I´m new to this forum, so hello everyone...

    I recently started working for a small company which uses Vray as its main render engine. Since my boss hasn´t had the time to set up a customer account for me on this forum yet, I´m posting here.
    I´m currently working on a rather complex project, an animation with dozens of shots containing both large exterior areas and zooms to very small details, as well as lots of vegetation and some character animation.
    It has been a particular challenge organizing the whole project (almost everything is either xrefed or proxied) but even more so rendering it.
    I kind of hit a dead end now trying to render the shots with animated objects.
    I followed the tutorial over at mintviz following every step, except that I skipped the secondary GI solution (lightcache) in favor of faster renderings.
    The problem I´m having now: After rendering a prepass for the irradiance map using "Animation prepass" mode, I tried rendering with "Animation Rendering" mode.
    The first couple of frames went well, but then the render times suddenly started to increase dramatically over night (to a couple of hours per frame).

    So far I´ve excluded netrendering Problems by copying the IRmap files to a local folder and rendering locally.
    The problematic files also seem to render fine, if I just calculate the IRMap in "Single Frame" mode.
    I haven´t touched the settings much, basically I just used the "medium animation" preset.

    Since we´re on a tight deadline I just excluded the animated objects from GI for now and then I will have to fix the lighting difference in post.

    I´m not sure I missed something, probably its a problem with my setup of the shots, but like I said: The shots are too complex do a error search from scratch, so I´d love to hear some ideas on what else I could have missed.

    We´re on Vray 2.30.01, if that helps.

  • #2
    Hi,

    It's difficult to say what is the reason for this without the scene file, but you can try to set "Default geometry" parameter to "Dynamic".
    Do you have Hair&Fur geometry in the scene?
    Tashko Zashev | chaos.com
    Chaos Support Representative | contact us

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    • #3
      Hi,

      well, for that project we just worked our way around it. Like I said, it was too complex to start a thorrough search for the problem, so we just "fixed it in post"...
      Since we´re almost always on a tight deadline, I haven´t touched GI in scenes with animated objects, because I didn´t want to risk beeing stuck on the renders.
      I kind of just wanted to know, if others have experienced similar problems and if, on what kind of scenes, so I could avoid the problem in the future.
      If I ever find the time I´ll test it with a simpler scene...but If anybody had similar problems, I´d love to hear about it!

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      • #4
        Brute force (with or without light cache) tends to work best for animation.

        Best regards,
        Vlado
        I only act like I know everything, Rogers.

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        • #5
          Hey Vlado,

          I already tried brute force and even a combination, where I only rendered the moving objects with brute force, but I couldn´t get frame times below 30 mins. per Frame, so I gave up on that.
          Our maximum rendertime we can afford is usually around 10 Mins per frame, so I do have to work around a lot of issues most of the time...

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          • #6
            Hi,

            years later I am unfortunately experiencing exactly the same thing!
            I am on a 2x Xeon E5-2698-v4 40 cores, 64GB of RAM, GTX TITAN X. 3DSMax 2017 and Vray 3.4.
            The first frames gets rendered very fast, 2:30/frames. But it increases gradually and by the 100th frame it takes about double.
            I monitored closely the problem and I see that the the problem are the prepasses. They gets slower and slower and the reason is that the CPU is for some reason not ruinning at full speed during those. When it comes to the final rendering pass the speed is normal (full CPU speed).
            I tried everything and I even made a clean install: didn't help. Now I finally found out I am not the only one experiencing this.

            If there is anything I can do to debug this, I am happy to.

            Thank you so much.

            - M

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