<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Hello, <DIV><BR class="khtml-block-placeholder"></DIV><DIV>I have written a Tcl/Tk application with VTK and in it I use three separate vtkTkRenderWidgets. This works fine on my Intel Mac 10.4.8, but I can't seem to get all three to display on my Windows XP machine, only 2 will actually render at any time. Packing or not packing in Tk does not seem to make a difference, only taking away one of the vtkTkRenderWidget declarations actually makes a difference. I declare them all similar to this:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">set vtkw [vtkTkRenderWidget .ren -width 800 -height 600 -rw renWin]</SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;"><BR class="khtml-block-placeholder"></SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000"><SPAN class="Apple-style-span" style="background-color: transparent;">with different values for ".ren" (always just below top level) and "renWin" . I did a few searches and the only similar issue I could find was here:</SPAN></FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><A href="http://public.kitware.com/pipermail/vtkusers/2001-December/058473.html">http://public.kitware.com/pipermail/vtkusers/2001-December/058473.html</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Although I'm only trying to create 3 render windows, not 16 so surely it's not an OpenGL driver issue? Has anyone experienced a problem like this before or have any useful information on how to go about solving it? Any help greatly appreciated!</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Thank you, </DIV><DIV>Romy</DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</DIV><DIV>Romy Schneider</DIV><DIV>Senior Visualization Specialist</DIV><DIV>Texas Advanced Computing Center</DIV><DIV>The University of Texas at Austin</DIV><DIV><A href="http://www.tacc.utexas.edu">http://www.tacc.utexas.edu</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>(512) 471-6683 (direct)</DIV><DIV>(512) 232-9084 (fax)</DIV><DIV><A href="mailto:romy@tacc.utexas.edu">romy@tacc.utexas.edu</A></DIV><DIV>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BODY></HTML>