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    [X1,Y1,Z1]=sphere(30);
Z=X1;
Z1(:,1:4)=NaN;
c1=ones(size(Z1));
surf(3*X1,3*Y1,3*Z1,c1);
%生成里面的小球
hold on
Z2=Z;
c2=2*ones(size(Z2));
c2(:,1:4)=3*ones(size(c2(:,1:4)));
surf(1.6*X1,1.6*Y1,1.6*Z2,c2);
colormap([0,1,0;0.5,0,0;1,0,0]);
grid on
hidden off;
axis equal;
hold off