The issue with the second surface not being produced using the “fill3” function arises from the vertices not being correctly defined for a 3D face. To achieve the desired box, it is essential to use the “hold on” and “hold off” commands, these commands are used to plot the surfaces on the same axis. Below is the revised code to accomplish this objective:
X = [1 26 26 1];
Y = [0.5 0.5 25.5 25.5];
Z_bottom = [0 0 0 0];
Z_top = [25 25 25 25];
fill3(X, Y, Z_bottom, 'blue');
hold on;
fill3(X, Y, Z_top, 'red');
X_sides = [1 1; 26 26; 26 26; 1 1];
Y_sides = [0.5 0.5; 0.5 0.5; 25.5 25.5; 25.5 25.5];
Z_sides = [0 25; 0 25; 0 25; 0 25];
for i = 1:4
fill3(X_sides(i, :), Y_sides(i, :), Z_sides(i, :), 'green');
end
axis equal;
xlabel('X-axis');
ylabel('Y-axis');
zlabel('Z-axis');
grid on;
hold off;
This is the output we get using the given code.
The “fill3” function can be explored on this documentation page - https://www.mathworks.com/help/releases/R2021a/matlab/ref/fill3.html
The “hold” command can be explored on this documentation page - https://www.mathworks.com/help/releases/R2021a/matlab/ref/hold.html
