Async Rendering Thread



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 20/11/2009 at 12:17, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   11.528 
    Platform:   Windows  ;   
    Language(s) :     C++  ;

    ---------
    I'm trying to run a render asynchronously in the background, much like C4D's Make Preview command. I've got the render running in a separate thread, but it seems a Wait command is necessary to get the thread to process the render. Once I add the Wait though, it locks the GUI. I've found several examples here for synchronous render processes, but none for async renders. My (simplified) code is below. Any tips?

      
    class AlioSeqThread : public C4DThread   
    {   
         private:   
              BaseDocument* m_doc;   
              BaseBitmap* m_bmp;   
              BaseContainer rdbc;   
              AlioSeqProgressData pd;   
      
         public:   
              AlioSeqThread(BaseDocument* adoc, BaseBitmap* abmp, BaseContainer bc, AlioSeqProgressData apd) { m_doc = adoc; m_bmp = abmp; rdbc = bc; pd = apd;} //constructor   
              virtual ~AlioSeqThread() { m_doc = NULL; m_bmp = NULL; End(); Wait(FALSE); StatusClear();} //destructor   
              virtual void Main(void);   
              virtual Bool TestDBreak();   
              virtual const CHAR *GetThreadName(void) { return "AlioSeqThread"; }   
    };   
      
    void AlioSeqThread::Main(void) {   
         LONG result = RenderDocument(m_doc, rdbc, AlioSeqProgressHook, &pd;, m_bmp, RENDERFLAG_EXTERNAL|RENDERFLAG_SHOWERRORS, this->Get());   
    }   
      
    Bool AlioSeqThread::TestDBreak() {   
         BaseContainer keyinput;   
         if(GetInputEvent(BFM_INPUT_KEYBOARD, keyinput) && (keyinput.GetLong(BFM_INPUT_CHANNEL) == KEY_ESC)) GePrint("esc");   
         return (GetInputEvent(BFM_INPUT_KEYBOARD, keyinput) && (keyinput.GetLong(BFM_INPUT_CHANNEL) == KEY_ESC));   
    }   
      
    class AlioRenderSeqCommand : public CommandData   
    {   
         public:   
      
              virtual Bool Execute(BaseDocument *doc) {   
                  BaseDocument *rdoc = (BaseDocument* )doc->GetClone(COPY_DOCUMENT, NULL);   
                  AlioSeqThread ast(rdoc, bmp, rdbc, pd);   
                  ast.Start(TRUE, THREADPRIORITY_BELOW);   
                  ast.Wait(TRUE);   
                  BaseDocument::Free(rdoc);   
                  return TRUE;   
              }   
    


  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 10/02/2010 at 15:14, xxxxxxxx wrote:

    Still having trouble finding a way to RenderDocument without locking the GUI. Any help?



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 10/02/2010 at 23:03, xxxxxxxx wrote:

    I see two problems.

    First, you're freeing the document right after you started the render. if it's asynchronous the render will get a problem as it is still rendering while you free the document.

    Second, you should not create an instance of the Thread Object on the stack as it also gets freed right after the Execute function returns. that way the TestBreak() function is called in the Destructor i guess.


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