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			Hi, thanks for your answer but there is a problem, the "clearWindow" isn't transparent. 
If I change the size or the position of this window (so that it doesn't overlap) I still see the environment in this "transparent" windows. Is this a bug or doesn't work the GL_STENCIL_BUFFER_BIT on my hardware?
		 
		
		
		
		
		
		
		
		
	
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