View a 2-d projection of a 3D object

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Lovett 2023-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/1961369-view-a-2-d-projection-of-a-3d-object

评论： Lovett 2023-5-11

I tried usind the matlab function "view" but it doesn't give a projected face

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Answer 1

Shaik 2023-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/1961369-view-a-2-d-projection-of-a-3d-object#answer_1232949

在 MATLAB Online 中打开

Hi Lovett,

The view function in MATLAB sets the camera viewpoint for the current figure, but it does not render the 3D object in perspective. To render a 3D object in perspective so that it appears to have depth in a 2D image, you can use the camproj and camva functions to adjust the camera projection and field of view (FOV). Here's an example:

% Generate some random data

x = randn(100,1);

y = randn(100,1);

z = randn(100,1);

% Plot the data as a 3D scatter plot

figure;

scatter3(x,y,z);

% Adjust the view to a projected 2D view from above

camproj('perspective'); % set perspective projection

camup([0 1 0]); % set camera up direction

campos([0 0 max(z)]); % set camera position

camva(30); % set camera view angle

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Lovett 2023-5-11

在 MATLAB Online 中打开

Thank you so much.

How do I use this to project each face of the solid generated by this code.

% Clear all previous commands
clear all
close all
clc
figure(2)
% Variables you can change
Sizex = 1; %average length of RVE
Sizey = 1;
Sizez = 1;
Def = 60; %definition
% Variables you shouldn´t change
SFactx = (Sizex/2)/pi; %size factor of RVE
SFacty = (Sizey/2)/pi;
SFactz = (Sizez/2)/pi;
A = SFactx*pi; %lowest and max coordinates of meshgrid
B = SFacty*pi;
C = SFactz*pi;
Dx = A/Def;%definition factor
Dy = B/Def;
Dz = C/Def;
% Generation of gyroids
[X,Y,Z] = meshgrid(-A:Dx:A, -B:Dy:B, -C:Dz:C); %creates mesh grid
    % Gyroid equation
    OBJ =(cos(X/SFactx).* sin(Y/SFacty) + cos(Y/SFacty).* sin(Z/SFactz)...
        + cos(Z/SFactz).* sin(X/SFactx)+(0));
     T = 0.5;
    OBJ =(OBJ-T);
   
   
    % Isosurface and isocap
    [F1,V1] = isosurface(X,Y,Z,OBJ,0);
    [F2,V2] = isocaps(X,Y,Z,OBJ,0,'below');
   
    %Combines isosurface and isocaps into one
    F3 = [F1;F2+length(V1(:,1))];
    V3 = [V1;V2];
   
    % Visualization
    P = patch('Vertices',V3,'Faces',F3,'FaceColor', ...
    'cyan','EdgeColor','none');
   
    view(3)
    camlight
   
    %Visualization
axis equal
stlwrite('G1-T05.stl',V3,F3)