GL Draw Line прямоугольник
glBegin(GL_LINE_LOOP) ;
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.5, 0.0);
glVertex3f(0.5, 0.5, 0.0);
glVertex3f(0.5, 0.0, 0.0);
glEnd() ;
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