set pm3d depth lighting 
set object rect from sc 0,0 to sc 1,1 behind fc "#114400"
set palette defined (0 "#ffcc66", 1 "#ffcc66")
set samples 256
set isosamples 24
unset border
unset tics
unset colorbox
unset key
set xyplane 0
set view 60,30, 1.8, 
set parametric
set urange [0:2*pi]
set vrange [0:2*pi]

set xrange [-8.5:9.5]
set yrange [-10:8]
set zrange [-8:10]


set term pngcairo size 360,360
set out "rope000.png"

x(u,v) = 3*cos(u) + 5*cos(3*u) + 3*(cos(u)\
          +5*cos(3*u))*cos(v)/(2*sqrt(234+90*cos(2*u)))\
          -3*cos(6*u)*(sin(u)+5*sin(3*u))*sin(v)\
          /((2*sqrt(13+5*cos(2*u)))*sqrt(22+5*cos(2*u)+9*cos(12*u)))
y(u,v) = 3*sin(u) + 5*sin(3*u) + 3*(sin(u)\
          +5*sin(3*u))*cos(v)/(2*sqrt(234+90*cos(2*u)))\
          +3*(5*cos(3*u)+cos(5*u)+cos(7*u)+5*cos(9*u))*sin(v)\
          /((4*sqrt(13+5*cos(2*u)))*sqrt(22+5*cos(2*u)+9*cos(12*u)))
z(u,v) = 3*sin(6*u)\
          - sqrt(13+5*cos(2*u))*sin(v)/(2*sqrt(22+5*cos(2*u)+9*cos(12*u)))

splot x(u,v), y(u,v), z(u,v) w pm3d

!display rope000.png