# 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
set yrange [ 0.00000 : 10.0000 ] noreverse
set pm3d depthorder 
set pm3d interpolate 1,1 flush begin noftriangles border linewidth 0.500 dashtype solid corners2color mean
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"