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Stencil Buffer

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How expensive is using the Stencil Buffer. I just finished making a little demo with a 3D model running across a slick(read : reflective) floor and when I just render the model and floor(without reflection), it runs great. However, whenever I enable reflection, the framerate drops dramatically, but when I dont use the stencil buffer and I just draw the inverted model, the framerate stays the same. Any insight to why this is happening?

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try glPrintf( "%s\n", glGetString( GL_VENDOR ) );
perhaps u have software
set the window to 32bit color and 24bit depth + 8 bit stencil (also the desktop to 24/32bitcolor)

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