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About the stencil test?

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Recently , I am learning NEHE''s OpenGL tutorials.In lesson 27, the tutorial tells me to use the stencil test to case shadow on the object.I look in MSDN Libaray,but I just can''t find out how stencil test operates.So can anyone tell me more about it? Many thanks!

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You controll the stencil buffer with the function
glStencilMask(), glStencilOp() and glStencilFunc()

Take a look at http://biology.ncsa.uiuc.edu/cgi-bin/infosrch.cgi?cmd=getdoc&coll=0650&db=bks&fname=/SGI_Developer/OpenGL_RM/6302 for more information.


"If it looks good, it is good computer graphics"
"If it looks like computer graphics, it is bad computer graphics"


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