cover.m

hold on;

[x,y,z] = sphere;
[i,j,k] = cylinder(3);
s2=surf(2.424*x, 2.424*y, (2.424*z)+2.424);
s3 = surf(i./(11*k+1),j./(11*k+1),(11*k)+1);
s4=surf(6*x,6*y,(6*z)+6);

set(s2, 'EdgeColor', 'k', 'FaceColor', 'k')
set(s2, 'LineWidth', 1)

set(s3, 'EdgeColor', 'g', 'FaceColor', 'none'); 
set(s3, 'LineWidth', 2)

set(s4, 'EdgeColor', 'r', 'FaceColor', 'none')
set(s4, 'LineWidth', 2)


axis([-6 6 -6 6 0 12]), axis off, grid off;
set(gca, 'DataAspectRatio' , [1 1 1]);
light;
view(-37.5,30);

shading interp;
material shiny;
lighting phong;
set(gcf, 'color', [0.5 0.5 0.5]);