rgl.lines(c(rx), c(0, 0), c(0, 0), col = "#000000")
rgl.lines(c(0,0),c(ry),c(0,0),col = "#000000")
rgl.lines(c(0,0),c(0,0),c(rz),col = "#000000")
rgl.lines(c(rx), c(0, 0), c(0, 0), col = "#000000")
rgl.lines(c(0,0),c(ry),c(0,0),col = "#000000")
rgl.lines(c(0,0),c(0,0),c(rz),col = "#000000")