Transparent shapes are not transparent to each other

I am trying to create a plot of a transparent cylinder with transparent shapes overlayed on top of it. The shapes are transparent to each other when the cylinder is not present, but only transparent to the cylinder when it is present. I'm not sure how to fix this. My code is:

fg = figure(1); clf;

set(fg,'Units','centimeters')

pos = [14,5,16,8];

set(fg,'Position',pos)
[X,Y,Z] = cylinder(0.11);
S = surf(Z,X,Y,'FaceColor','k','FaceAlpha',0.2,'EdgeColor','none');
rotate(S,[0,1,0],20)

X_n = get(S,"XData");
Y_n = get(S,"YData");
Z_n = get(S,"ZData")-1;
clf;
S_n = surf(X_n,Y_n,Z_n,'FaceColor','k','FaceAlpha',0.15,'EdgeColor','none');
view(2)
ylim([-0.25,0.25])
xlim([-0.0,1.0])
grid off
set(gca,'XTick',{},'YTick',{},'XColor','w','YColor','w')
hold on
f = @(x,a) 0.2*exp(-300*(x-a).^2.);
x = 0:0.001:1;
for k = 0:10
    if mod(k,3)
        plot(x,f(x,k*0.1)-0.1,'r')
        patch([0,x,1],([0,f(x,0.1*k),0]-0.1),'r',"FaceAlpha",0.2,"EdgeColor",'r',"EdgeAlpha",0.1)
        if k ~= 10
            plot(k*0.1,0,'r+')
        end
    else
        plot(x,f(x,k*0.1)-0.1,'b')
        patch([0,x,1],([0,f(x,0.1*k),0]-0.1),'b', 'FaceAlpha', 0.2,"EdgeColor",'b',"EdgeAlpha",0.1)
        if k
            plot(k*0.1,0,'bx')
        end
    end
end
hold off

I've tried changing patch to a 3-d patch, and using fill, fill3 and polyshape with plot, but they all produce the same results. Commenting out the cyinder surface plot makes the shapes transparent to eachother again, but for some reason including this surface changes this.

Answer 1

[Voss]

Using the 'painters' Renderer fixes the problem:

fg = figure(1); clf;

fg.Renderer = 'painters';

set(fg,'Units','centimeters')

pos = [14,5,16,8];

set(fg,'Position',pos)
[X,Y,Z] = cylinder(0.11);
S = surf(Z,X,Y,'FaceColor','k','FaceAlpha',0.2,'EdgeColor','none');
rotate(S,[0,1,0],20)
X_n = get(S,"XData");
Y_n = get(S,"YData");
Z_n = get(S,"ZData")-1;
% clf;
delete(S);
S_n = surf(X_n,Y_n,Z_n,'FaceColor','k','FaceAlpha',0.15,'EdgeColor','none');
view(2)
ylim([-0.25,0.25])
xlim([-0.0,1.0])
grid off
set(gca,'XTick',{},'YTick',{},'XColor','w','YColor','w')
hold on
f = @(x,a) 0.2*exp(-300*(x-a).^2.);
x = 0:0.001:1;
for k = 0:10
    if mod(k,3)
        plot(x,f(x,k*0.1)-0.1,'r')
        patch([0,x,1],([0,f(x,0.1*k),0]-0.1),'r',"FaceAlpha",0.2,"EdgeColor",'r',"EdgeAlpha",0.1)
        if k ~= 10
            plot(k*0.1,0,'r+')
        end
    else
        plot(x,f(x,k*0.1)-0.1,'b')
        patch([0,x,1],([0,f(x,0.1*k),0]-0.1),'b', 'FaceAlpha', 0.2,"EdgeColor",'b',"EdgeAlpha",0.1)
        if k
            plot(k*0.1,0,'bx')
        end
    end
end
hold off

[Amir Raz]

Thanks!

[Voss]

You're welcome!