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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Hello World - The "getting started" example of iso2mesh
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% In this example, we illustrate the basic mesh density and precision
% controls in iso2mesh.
%% the first step is to load a binary or gray-scale image
hw = imread('helloworld.png');
% now we stack the image and form a binary volume
hw3d = 1 - repmat(hw, [1 1 50]);
%% create 3D mesh |--------> threshold at v=0.7
[node, elem, face] = v2m(hw3d, 0.7, 5, 40);
% | |-> maximum volume
% |----> maximum surface triangle size
figure;
subplot(211);
plotmesh(node, face);
axis equal;
view(90, 60);
subplot(212);
plotmesh(node, elem, 'z<20');
axis equal;
view(90, 60);
% mesh with denser surface |----> surface triangle size is now 2
[node, elem, face] = v2m(hw3d, 0.7, 2, 40);
figure;
subplot(211);
plotmesh(node, face);
axis equal;
view(90, 60);
subplot(212);
plotmesh(node, elem, 'z<20');
axis equal;
view(90, 60);
%% create 3D mesh from gray-scale image to get smoother boundary
hw = imread('helloworld_gray.png');
hw3d = 255 - repmat(hw, [1 1 50]);
[node, elem, face] = v2m(hw3d, 128, 2, 40);
figure;
subplot(211);
plotmesh(node, face);
axis equal;
view(90, 60);
subplot(212);
plotmesh(node, elem, 'z<20');
axis equal;
view(90, 60);
%% create 3D mesh from gray-scale image with advanced distbound control
clear opt;
opt.radbound = 4; % set surface triangle maximum size
opt.distbound = 0.2; % set max distance that deviates from the level-set
opt.autoregion = 1;
[node, elem, face] = v2m(hw3d, 128, opt, 40);
figure;
subplot(211);
plotmesh(node, face);
axis equal;
view(90, 60);
subplot(212);
plotmesh(node, elem, 'z<20');
axis equal;
view(90, 60);
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