#---------------------------------------------
#
# more examples
#
set dummy u,v;
set title "Yet Another Parametric Surface"
a=sur{ [(3*u+3*u*v^2-u^3), (3*v+3*u^2*v-v^3), 3*u^2-3*v^2]
	[u=-1.5: 1.5][v=-1.5:1.5]};

plot a;
set dummy x,y;
