How can I calculate the surface area of a stl file with a cutting plane?

Hi everybody,

I need hepl for this task: I opened a stl file in matlab, but I would like to make calculations such as surface, volume ecc.

In particular, my goal is to calculate the surface area of the stl shown below from the top to a depth of 0,1 mm.

To date, I could basically highligth part of my stl but the code needs improvements. Could you help me?

Thank you very much!

fv = stlread('G05.stl');
patch(fv,'FaceColor',       [0.8 0.8 1.0], ...
         'EdgeColor',       'none',        ...
         'FaceLighting',    'gouraud',     ...
         'AmbientStrength', 0.15);
camlight('headlight');
material('dull');
axis('image');
view([-135 35]);
x1 = -10; 
x2 = 10;
y1 = -10; 
y2 = 10;

%pks = findpeaks(G05.stl)
%zmax= max(G05.stl);
z1 = 0.2286;

[r] = find((fv.vertices(:,1)>=x1 & fv.vertices(:,1)<=x2) & (fv.vertices(:,2)>=y1 & fv.vertices(:,2)<=y2) & (fv.vertices(:,3)>=z1));

    for i = 1:size(r,1)
    interest.vertices(i,:) = fv.vertices(r(i,1),:);
    % interest.faces(i,:) = fv.faces(r(i,1),:);
    end
    for i = 1:size(r,1)/3
        interest.faces(i,3) = 3*i;
        interest.faces(i,2) = 3*i-1;
        interest.faces(i,1) =3*i-2;
    end
    
patch(interest,'FaceColor', [1 0 0], 'EdgeColor','none', 'FaceLighting',    'gouraud', 'AmbientStrength', 0.15);
camlight('headlight');
material('dull');

%[x,y,z] = peaks;
%[area,cellAreas,centroid] = surfarea(x,y,z);

[KSSV]

YOu want to calculate the area of the surface which is shwon red?

[Flavia Lerra]

Hi,

actually, I would like to automatically highlight the stl zone between the maximum point and a defined depth (like 0,1 mm from the maximum point downward) and calculate that surface.

In the code that I posted I entered the cordinates below but they were found by trials.

x1 = -10;

x2 = 10;

y1 = -10;

y2 = 10;

z1 = 0.2286