gl.glStencilFunc (GL.GL_EQUAL, 0x01, 0x01);
gl.glStencilOp (GL.GL_ZERO, GL.GL_ZERO, GL.GL_ZERO);
gl.glColor4f(0.0f, 0.0f, 0.0f, 1.0f);
gl.glBegin (GL.GL_QUADS);
gl.glVertex3f (minMax[0], minMax[1], 0.0f);
gl.glVertex3f (minMax[2], minMax[1], 0.0f);
gl.glVertex3f (minMax[2], minMax[3], 0.0f);
gl.glVertex3f (minMax[0], minMax[3], 0.0f);
gl.glEnd ();