how to generate planar projections from a 3d model

Question

luca antonioli 2019-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/471809-how-to-generate-planar-projections-from-a-3d-model

评论： darova 2020-2-7

hi, I have this model of an eye with different points that represent different structures... ( MATLAB figure)

I want to plot a projection along the z plane (like the first figure).

my idea is to generate different contours,for each structure,with the same z-coordinate and then, with polyftit/polyval ( or also b-spline) interpolate and generate the the contour in different planes,and at the end select the plane in which the x and y coordinates are bigger in modulus. is the idea correct?

are there other easer ways to generate contours?? any other methods able to generate isolines or isosurfaces?

should I consider contour3?

thanks

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Answer 1

darova 2019-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/471809-how-to-generate-planar-projections-from-a-3d-model#answer_383367

在 MATLAB Online 中打开

You want crossection of a surface in Z and other planes. Here is an example:

clc,clear
[X,Y,Z] = peaks(40);
figure(1)
contour3(X,Y,Z,-7:7)        % create crossections in Z direction
hold on
    % i don't know how extract contour
    % without plotting
    % so i just plot in the other figure
figure(2)
C = contour(Z,Y,X,-3:3);    % extract contour in X direction
figure(1)                   % switch to the first figure
k = 1;
for i = 1:length(-3:3)
    n = C(2,k);             % number of points in the contour group
    x = C(1,k);             % x level
    x = x +(1:n)*0;
    z = C(1,(1:n)+k);
    y = C(2,(1:n)+k);
    plot3(x,y,z)
    k = k+n+1;              % index of the next contour group
end
hold off