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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You have to call Render on the
renderwindow, which in turn calls render on the underlying renderers and then
Frame to copy the result to screen.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>JB</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Vidyadhar
[mailto:vidyadhar@lucidindia.net] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 13 October 2003 03:27<br>
<b><span style='font-weight:bold'>To:</span></b> vtkusers@vtk.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [vtkusers] Rendering
layers</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>From</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Vidyadhar</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I use Windows2000 with VC++ 6.0.</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I needed a zoom window facility. I
found suitable code in TCL from which I converted code to C++. I have
subclassed vtkInteractorStyle to create new style for my purpose. It works
fine. I have fairly large volume data and in its presence the render call from
style (this->Interactor->Render()) is very slow. So I tried something
like this.</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I created two renderers for same
render window and they share camera too. I added my actual data in layer 0 renderer
and nothing is added to layer 1 renderer. I checked that in style code,
PokedRenderer turns out to be the one on layer 1 and it is to this that my
style code will add its actor. My idea is to render just the top layer and
leave the slower rendering actual data alone. I tried using Render() methods of
both vtkRenderer and vtkActor. Each executes without problem but the screen is
not updated. Which method should I use and what else I need to do so the render
window gets selectively updated.</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thanks for listening to me.</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Any guidance will be appreciated.</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Yours</span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Vidyadhar</span></font></p>
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