set pm3d interpolate 0,0 depth lighting primary 0.8 specular 0.5
set object rect from sc 0,0 to sc 1,1 behind fc "#114400"
set palette defined (0 "#993300", 1 "#993300")
set samples 128
set isosamples 64
unset border
unset tics
unset colorbox
unset key
set xyplane 0
set view 75,30, 1.8,
set term pngcairo size 360,360
set out "bottle000.png"
set parametric

D = 0.7
R(x) = D*exp(-3*(x-7))/(1+exp(-3*(x-7))) + (1.05-D)
x(u,v) = R(u)*cos(v)
y(u,v) = R(u)*sin(v)
z(u,v) = u
set urange [0:10] 
set vrange [-pi:pi]
set zrange [0:10]
set xrange [-5:5]
set yrange [-5:5]

splot x(u,v), y(u,v), z(u,v) w pm3d
!display bottle000.png