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OpenGL Stencil buffer question

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I have one question about the stencil buffer,Soppuse that I want to create 3d model of a fighter cockpit.The cockpit of course is transparent(or there wont be any polygon there) in the area that the pilot sees.So why do I have to use the STENCIL buffer since as the OpenGL will draw the cockpit and anything else that is out of it in the transparent area?Is a matter of speed?

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