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")
text3d(rx[2]+1,0,0, xlab)
text3d(0,ry[2]+1,0, ylab)
text3d(0,0,rz[2]+1, zlab)
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")
text3d(rx[2]+1,0,0, xlab)
text3d(0,ry[2]+1,0, ylab)
text3d(0,0,rz[2]+1, zlab)