# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'pm3d_clip.2.png'
set border -1 front lt black linewidth 1.000 dashtype solid
set grid nopolar
set grid xtics nomxtics ytics nomytics ztics nomztics nortics nomrtics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid vertical layerdefault   lt 0 linecolor 0 linewidth 0.500,  lt 0 linecolor 0 linewidth 0.500
unset key
set view 57, 25, 1, 1
set samples 13, 13
set isosamples 7, 7
set xyplane relative 0
set title "Smooth intersection of pm3d surfaces" 
set xrange [ 0.00000 : 10.0000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set yrange [ 0.00000 : 10.0000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set pm3d depthorder 
set pm3d interpolate 1,1 flush begin noftriangles border linewidth 0.500 dashtype solid corners2color mean
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front  noinvert bdefault
unset colorbox
f(x,y) = x**2 + y**2 * (1 - x)**3
NO_ANIMATION = 1
splot (x*x+y*y) with pm3d fc "yellow", 100-(x*x+y*y) with pm3d fc "forest-green"