[vtkusers] abort lengthy volume rendering

[Dean Inglis]

I am using a tweaked version of John Biddiscombe's C++ Builder
BvtkRenderWindow and am developing an app with features similar to VolView.
How does one go about interrupting a lengthy volume rendering, e.g., during
a ray casting render with just a mouse click?  I have tried the following:


        FRenderWindow = vtkWin32OpenGLRenderWindow::New();
        void (*pf) ( void *) = &CheckAbortFunc;
        FRenderWindow->SetAbortCheckMethod( pf , reinterpret_cast<void
*>(FRenderWindow));
        AbortFlag = FRenderWindow->GetAbortRender();

then...

void CheckAbortFunc(void *ptr)
{
  vtkWin32OpenGLRenderWindow* ptrWin =
reinterpret_cast<vtkWin32OpenGLRenderWindow*>(ptr);
  if ( ptrWin )
  {
    if(ptrWin->GetEventPending())
    {
       ptrWin->SetAbortRender( AbortFlag );
       Beep();
     }
  }
}

the documentation is not explicit enough for vtkRenderWindow and its derived
classes for the following:

GetAbortRender, SetAbortRender, GetInAbortCheck, GetEventPending,
CheckAbortStatus

Can anyone provide some insight on the use of these methods?

thanks,
Dean

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dean Inglis, Ph.D.
Clinical Research Unit
25 Charlton Avenue East, Unit 610
Hamilton, Ontario
L8N 1Y2
Tel: (905) 527-0028
Fax: (905) 521-1297
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~