isosurface both delete;
isosurface zero delete;
isosurface both cutoff @isoval sign red blue "";
if (@isosolid); isosurface both nodots nomesh fill; color $both opaque; endif;
if (@isotrans); isosurface both nomesh nodots fill; color $both translucent; endif;
if (@isomesh); isosurface both nodots nofill mesh; color $both opaque; endif;
if (@isozero); isosurface zero cutoff 0.000001 "";isosurface zero nofill nodots mesh; color $zero [150,255,150]; endif;
color echo black;
font echo 15 bold;
set echo bottom right;
temp = "iso-surface value: " + @isoval;
echo @temp;