Results 1 to 7 of 7

Thread: Frame Rendering times get progressively longer

  1. #1
    Newbie Member
    Join Date
    May 2010
    Location
    San Jose
    Posts
    7

    Frame Rendering times get progressively longer

    My problem:
    When I render a 150 frame scene each frame render time gets progressively longer.

    For instance:
    frame 30=30 seconds
    frame 40=45 seconds
    frame 51=103 seconds
    I restart the render and
    frame 52-58 = about 54 seconds
    frame 60 = 60 seconds
    frame 70 = 67 seconds
    frame 73 = 73 seconds
    frame 77 = 86 seconds
    frame 82 = 105 seconds
    frame 87= 125 seconds
    frame 88= 129 seconds

    I restart the render and
    frame 89= 30 seconds
    frame 91= 29 seconds
    frame 93 = 30 seconds
    frame 94 = 36 seconds
    frame 95= 41 seconds

    It is not that the onscreen complexity increasing, because as shown above, when I restart the rendering the renders times speed up.

    I have tried restarting my Mac, quitting and relaunching lightwave.
    My files are all local to my hard drive

    Details on the file:
    1920x1080
    Radiosity=Final gather
    antialiasing = 6
    RecFilter = Classic
    Adative = off
    Motion blur = off
    Ray tracing on for Shadows, Relections
    8 render threads.

    Details on setup
    Mac Pro 2x3.2 GHz Quad Core Intel Xeon
    8 core
    26 GB Ram
    OS X 10.6.7

    Has anyone seen this before? Uncertainties like this drive me nuts.

    This is my first major project now that I finally installed Lightwave 10, so perhaps that is where the problem lies. I have been using Lightwave for over 11 years, so I'm not a complete moron, but I always feel a bit insecure using it.
    Bill
    The bigger the goverment, the smaller the citizen.

  2. #2
    TrueArt Support
    Join Date
    Feb 2003
    Location
    Poland
    Posts
    7,901
    Are you using GI cache? or other caches?
    Every frame you have new samples added to cache, and checking them increases render time.

  3. #3
    Newbie Member
    Join Date
    May 2010
    Location
    San Jose
    Posts
    7
    Sensei,

    I do have Global Illumination cache on. I've now turned it off and restarted the render I will have to collect a series of frames to determine if that fixes the problem.

    I had GI on because without it sometimes the Raydiosity creates a flicker. Do you know a way around that?
    Bill
    The bigger the goverment, the smaller the citizen.

  4. #4
    TrueArt Support
    Join Date
    Feb 2003
    Location
    Poland
    Posts
    7,901
    Why new GI sample is made? Because there is not enough existing samples meeting tolerance and angle.
    New one is made, and put to cache, and it grows and grows, every frame.
    To check what is GI average there is needed to scan all samples in range. The more samples, the slower.
    I would just leave as is. Or buy new machine(s) and build renderfarm. If it's paid job. Flickering is kinda unacceptable.
    Quiting and restarting render will destroy GI cache, so there will be flickering again in place you stopped render.
    You can try calculating GI cache at once in Render Globals, and then lock GI cache permanently.

  5. #5
    AeroAnimator 4dartist's Avatar
    Join Date
    Feb 2003
    Location
    Chattanooga, TN
    Posts
    1,066
    It's the GI cache.. it's annoying as hell.

  6. #6
    Banned OnlineRender's Avatar
    Join Date
    Dec 2008
    Location
    Glasgow , Scotland , UK
    Posts
    6,359
    cheat the GI , spinning light trick

  7. #7
    Newbie Member
    Join Date
    May 2010
    Location
    San Jose
    Posts
    7
    Thanks guys, it looks like Global illumination was the culprit.

    Sensei,
    I appreciate the fast answer.

    4D Artist Ben,
    Thanks for the commiseration, it's nice to know the pain I feel is not unique to me nor solely due to my own incompetence. BTW, your demo real is beautiful.

    Online Render,
    Spinning light trick... that's kicking it oldschool. Well if it ain't broke don't fix it, so I guess I'll reuse that old trick in the future.
    Bill
    The bigger the goverment, the smaller the citizen.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •