<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">An update for those who may have similar issues in the future:<DIV><BR class="khtml-block-placeholder"></DIV><DIV>I solved my problem by changing the order in which I packed and placed Tk widgets in my window. I'm still not sure why this in particular solved the issue, but I was placing a button in the same frame as the renderer with the 'place' command. Moving the declaration and placement of this button to after the render window widget declaration and packing caused Windows (or Tcl/Tk) to allow my third renderer to be seen.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Romy</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><DIV><DIV>On Jan 23, 2007, at 11:23 AM, Romy Schneider wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">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></BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>