matlab遗传算法三目标优化，出来的pareto前沿图只是二维图啊？

三目标不是三维图么？怎么修改啊/、
function f=multidisk(x)
global I1 I2 F
r=350;u=0.5;fai=1;W=3400;v=44.4444;m=4; tc=6.5; Dh=75;Wa=W*m;g=9.8;
Dmax=300;Tmax=260;Ti=35; Pmax=3;P0max=7;
J=4180;c=0.113;rou=7.8*10^(-6);E=Wa*v*v/(2*m*g);
n0=500*v/(pi*r);
F=pi/4*x(4)*x(4)*x(6);
I1=0; I11=0; I12=0; I13=0;
I2=0; I21=0; I22=0; I23=0;
n=100;delt=x(2)/n;t=x(1)-x(2)/2;
for k=1:(n+1)
l(k)=2*t*acos((x(1)*x(1)+t*t-(x(2)/2)*(x(2)/2))/(2*x(1)*t));
yI1(k)=l(k)/t;
if (k-1)==0||(k-1)==n
I11=I11+1/3*yI1(k);
elseif rem(k-1,2)~=0
I12=I12+4/3*yI1(k);
else
I13=I13+2/3*yI1(k);
end
t=t+delt;
end
I1=(I11+I12+I13)*delt;
I1=real(I1);
t=x(1)-x(2)/2;
for k=1:(n+1)
l(k)= 2*t*acos((x(1)*x(1)+t*t-(x(2)/2)*(x(2)/2))/(2*x(1)*t));
yI2(k)=l(k)/I1;
if (k-1)==0||(k-1)==n
I21=I21+1/3*yI2(k);
elseif rem(k-1,2)~=0
I22=I22+4/3*yI2(k);
else
I23=I23+2/3*yI2(k);
end
t=t+delt;
end
I2=(I21+I22+I23)*delt;
I2=real(I2);
f(1)=W*v*v*1000/(4*pi*F*u*I2*n0*g);
f(2)=x(5);
f(3)=4*3.4265e+005/(4180*pi*0.113*7.8e-6*x(3)*x(3)*x(5));
clear
clc
fitnessfcn=@multidisk;
nvars=6;
A=[];b=[];
Aeq=[];beq=[];
x0=[105;40;256;48;12;3];
lb=[80;30;250;40;10;1];
ub=[120;60;280;70;13;7];
options=gaoptimset( 'ParetoFraction',0.3,'PopulationSize',300,'generations',200,'StallGenLimit',200,'TolFun',1e-100,'PlotFcns',@gaplotpareto);
[x,fval]=gamultiobj(fitnessfcn,nvars,A,b,Aeq,beq,lb,ub,options);