%k3dsurf shoe

input mp-solid

invnormale:=-1;

%1''
figureespace(-10u,-10u,10u,10u);
Initialisation(1000,50,20,50);
incolor:=gris;
arcenciel:=true;
draw Sparam("(u,v,((u**3)/3)-0.5*(v**2))",-2,2,0.16,-2,2,0.16);
finespace;
end