How can I let my object repeat over time when animating it?

Hello, I am trying to animate a 3d object with the information from the arduino serial port, but the object only appears in another position and the past is not removed, just like this:

Any idea how to make only the figure move without it reappearing? here is the code

clc
for i = 1:20

           delete(instrfind({"Port"},{"COM6"}));
           micro=serial("COM6");
           micro.BaudRate=9600;
           warning("off","MATLAB:serial:fscanf:unsuccesfulRead");

           fopen(micro)

           savedData = fscanf(micro,"%s");
            v = strsplit(savedData, ',');
            ra = str2double(v(7));
            pa= str2double(v(6));
            ya= str2double(v(1));

offset_3d_model=[0, 0, 0];
sb= "F22jet.stl";

[Model3D. rb.stl_data.vertices, Model3D.rb.stl_data.faces,~,~]= stlRead(sb);
Model3D.rb.stl_data.vertices= Model3D.rb.stl_data.vertices-offset_3d_model;

AC_DIMENSION = max(max(sqrt(sum(Model3D.rb.stl_data.vertices.^2,2)))) ;

AX=axes("position",[0.0 0.0 1 1]);
axis off
scrsz = get(0,"ScreenSize");
set(gcf,"Position",[scrsz(3)/40 scrsz(4)/12 scrsz(3)/2*1.0 scrsz(3)/2.2*1.0], "Visible","on");
set(AX,"color","none");
axis("equal")
hold on;
cameratoolbar("Show")

AV_hg = hgtransform("Parent",AX,"tag","ACRigidBody");

for j=1:length(Model3D.rb)
AV = patch(Model3D.rb(j).stl_data, "FaceColor", [0 0 1], ...
"EdgeColor", "none",  ...
"FaceLighting", "gouraud", ...
"AmbientStrength", 0.15, ...
"Parent", AV_hg);
end

axis("equal");
axis([-1 1 -1 1 -1 1] * 1.0 * AC_DIMENSION)
set(gcf,"Color",[1 1 1])
axis off
view([30 10])


camlight("left");
material("dull");

M=makehgtform("xrotate",ra);
M2=makehgtform("yrotate",pa);
set (AV_hg, 'Matrix', M);
set (AV_hg, 'Matrix', M);
drawnow
delete(micro);
end

Answer 1

[Simon Chan]

Try to preallocate 'AV' before the for loop and change the data each time inside the for loop:

AV = patch('Faces',1,'Vertices',[NaN NaN], "FaceColor", [0 0 1], ...
    "EdgeColor", "none",  ...
    "FaceLighting", "gouraud", ...
    "AmbientStrength", 0.15, ...
    "Parent", AV_hg);
%
for j=1:length(Model3D.rb)
    set(AV,'Faces', Model3D.rb.stl_data.faces,'Vertices',Model3D.rb.stl_data.vertices)
end