BaseTime and doc->SetTime()



  • On 09/09/2017 at 19:29, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   R14 
    Platform:   Windows  ;   
    Language(s) :     C++  ;

    ---------
    Hi folks,

    Edit: same thing happens in the main thread too.

    I'm running a threaded operation where I'm playing back a scene in memory. Nothing fancy, just trying to make the document increment one frame at a time. I'm doing this by:

    //psuedo code, doc is in memory only
      
    BaseTime tm;
    tm.SetDenominator(1.0);
      
    // for the purposes of here, lets assume we're wanting frame 23
    tm.SetNumerator(1.0/doc->GetFps()*23);
      
    doc->SetTime(tm); // does not set to frame 23
    doc->ExecutePasses(this->Get(),TRUE,TRUE,TRUE,BUILDFLAGS_0); // always returns TRUE
      
    // this always returns RENDERESULT_OK
    REDERESULT render = RenderDocument(doc,rdata,nullptr,nullptr,Multipass,RENDERFLAGS_EXTERNAL|RENDERFLAGS_NODOCUMENTCLONE|RENDERFLAGS_PREVIEWRENDER,this->Get());
      
    // if I print the frames from the basetime and the doc, this is what I get
    GePrint("Time frame = " + RealToString(tm.GetFrame(..)); // CORRECT 23
    GePrint("doc frame = " + RealToString(doc->GetTime().GetFrame(doc->GetFps()))); // INCORRECT 0
    

    The problem I'm having is that the document is not animated to the correct frame. What I have noticed, is that the document changes time based on the frame rate. So if the frame rate is 30fps, then when I set the document time with any frame from 0-29, it only executes frame 0, and when the frame count reaches frame 30 the document is then set to the correct frame. The same thing happens from frames 30-59, the doc doesn't change until it gets to frame 60. It seems to go in multiples of the frame rate.

    Is there something about BaseTime I'm not understanding, or doc->SetTime()? Is there something about doing this in a threaded environment means it won't animate correctly? Or, is this another issue, some function call I've missed? An incorrect flag? Something in my math? Something else?

    WP.



  • On 10/09/2017 at 00:36, xxxxxxxx wrote:

    Set the numerator to the desired frame (23) and the denominator to the document frame rate (e.g 30). This will set the time to 23/30ths of a second.

    Steve



  • On 10/09/2017 at 02:14, xxxxxxxx wrote:

    Hi Steve,

    that's what I originally had, which is why I changed it to the above, to try something different (loosely based off some code I saw here somewhere). I was under the impression BaseTime worked as a fraction, e.g. 3 over 25, or 0.25 over 1.0, and that it didn't matter so much the values you set it with but the fraction value it's worth (if that makes sense!).

    I changed it back, and the issue is still there, although I can see that the doc time is now showing the correct frame. But it's still not drawing the correct frame.

    WP.



  • On 11/09/2017 at 02:47, xxxxxxxx wrote:

    Don't know if it's RenderDocument() doing something here or not. I can GePrint() the correct frame just before I render it, but the rendered frame is not the correct frame.

    // prints correct frame
    GePrint("Rendering frame " + RealToString(doc->GetTime().GetFrame(Animation->GetFps())));
    BaseContainer rdata;
    Set_RenderData(&rdata,Width,Height);  // sets some default render settings
    rdata.SetTime(RDATA_FRAMEFROM,doc->GetTime());
    rdata.SetTime(RDATA_FRAMETO,doc->GetTime());
      
    // renders incorrect frame
    RENDERRESULT Result = RenderDocument(doc,rdata,nullptr,nullptr,Renderer,RENDERFLAGS_EXTERNAL|RENDERFLAGS_NODOCUMENTCLONE,Thread);
    

    WP.



  • On 11/09/2017 at 03:00, xxxxxxxx wrote:

    D'oh! I wasn't setting the frame rate in the render container!

    I'll see myself out. Tongue

    WP.



  • On 11/09/2017 at 09:32, xxxxxxxx wrote:

    Hi,

    I'm glad you found your problem. Don't feel bad about it, we all have these days...

    For everybody reading this thread in future:

    1. As steve pointed out, the code in the first post does not properly set BaseTime.
    2. The manuals on BaseDocument (Animate) and BaseTime may help on this topic.

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