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Help,My puzzle about coordinate value in OpenGL

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In my OpenGL,when I used coordinate value over 1.0,i always failed. for example: glBegin(GL_TRIANGLE) glVertex3f(0.0,0.5,0.0); glVertex3f(-0.5,-0.5,0.0); glVertex3f(0.5,-0.5,0.0); glEnd(); this ok,but glBegin(GL_TRIANGLE) glVertex3f(0.0,20.0,0.0); glVertex3f(-20.0,-20.0,0.0); glVertex3f(20.0,-20.0,0.0); glEnd(); won't work? Could somebody tell me why? thanks ~~~ ^_^

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