Plotting 3d phase space using Simulink and Matlab

Hello, and thanks for your help.

I have made a simulink simulation that outputs 3 state variables (x1,x2,x3) like this:

I need to plot the evolution of said state variables in a 3d phase plot inside Simulink, the graph doesn't have to update in real time, it's fine if it appears after the simulation is complete.

As you can see, I tried using a matlab block that contains the following code:

function plot3d(x1,x2,x3)
hold on;
grid on;
plot3(x1,x2,x3);

However, this code outputs nothing, what's even worse, once the simulation is complete all I see is a blank 2d graph. I'd like to know whether there's some Simulink function that allows me to do what I want (I could find none so far), or how I can improve my code to achieve the desired output.

Thank you.