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<DIV><FONT size=2>Bingo! xabi, you are great</FONT><FONT size=2>!!</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>I use another way to do this, it seems better to 
work:</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>&nbsp;vtkRenderWindow* pRenderWindow = 
pWindow-&gt;getRenderWindow();<BR>&nbsp;vtkRenderer* pRenderer = 
pRenderWindow-&gt;GetRenderers()-&gt;GetFirstRenderer();</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT 
size=2>&nbsp;pRenderWindow-&gt;OffScreenRenderingOn();<BR>&nbsp;<BR>&nbsp;vtkRenderLargeImage* 
pRenderLargeImage = 
vtkRenderLargeImage::New();<BR>&nbsp;pRenderLargeImage-&gt;SetInput(pRenderer);<BR>&nbsp;pRenderLargeImage-&gt;SetMagnification(1);</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>&nbsp;vtkBMPWriter* pBMPWriter = 
vtkBMPWriter::New();<BR>&nbsp;pBMPWriter-&gt;SetInputConnection(pRenderLargeImage-&gt;GetOutputPort());<BR>&nbsp;pBMPWriter-&gt;SetFileName("C:\\ExportRenderWindow2BMP.jpg");</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT 
size=2>&nbsp;pWindow-&gt;getRenderWindow()-&gt;Render();<BR>&nbsp;pRenderLargeImage-&gt;Modified();<BR>&nbsp;pBMPWriter-&gt;Write();</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT 
size=2>&nbsp;pRenderLargeImage-&gt;Delete();<BR>&nbsp;pRenderWindow-&gt;OffScreenRenderingOff();</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>It is important for the OffScreenRenderingOn() function, thank 
xabi again!</FONT></DIV></BODY></HTML>