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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I’m trying to have an application that drives scene content change on its own, while still allowing the user to manipulate the scene with vtkRenderWindowInteractor. The approach I’m trying to use is to have the vtkRenderWindowInteractor run in a background thread, with some concurrency protection to keep it from invoking the rendering pipeline at the same time the main thread tries to do so. My application main thread creates all the vtk objects (actor, render window, renderer, interactor), registers a couple of callbacks for the interactor style’s StartInteractionEvent and EndInteractionEvent which lock and unlock a vtkCriticalSection, respectively, and then spawns a background thread in which the interactor is started. The main thread then, periodically, locks the critical section, makes scene changes, renders, and unlocks the critical section. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Although this approach seems sound in principle, I’m encountering corruption that leads me to believe that there is some kind of pipeline manipulation occurring before processing the StartInteractionEvent that is conflicting with what I’m doing in my main thread. Can someone with detailed knowledge of pipeline bowels provide some insight as to what might be going on, and perhaps provide an alternate course of action?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:24.0pt;font-family:"Monotype Corsiva"'>Chris</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>--<br>Christopher R. Volpe, Ph.D. </span><span lang=FR style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Email: <a href="mailto:cvolpe@ara.com">cvolpe@ara.com</a> <o:p></o:p></span></p><p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Senior Scientist, Information Exploitation Systems Main Desk: 919-582-3300<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'><a href="http://www.ara.com/">Applied Research Associates, Inc</a> Direct: 919-582-3380<o:p></o:p></span></p><p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Times New Roman","serif"'>8537 Six Forks Rd., Suite 6000 Fax : 919-582-3301<o:p></o:p></span></p><p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Raleigh, NC 27615 Web: </span><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'><a href="http://www.ara.com/offices/NC.htm" title="http://www.ara.com/offices/NC.htm">http://www.ara.com/offices/NC.htm</a></span><span lang=FR style='font-size:10.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <span style='font-size:12.0pt'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>