Apollo Capsule 3D Model

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Fredrick_jong 2013-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/67062-apollo-capsule-3d-model

Hi,

I am trying to model the Apollo Space capsule as a 3D shape in MATLAB but I am unsure of how to even begin doing so. If any one could possibly point me in the right direction, that would be very much appreciated. Many thanks in advance!

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Cedric 2013-3-16

You could try to ask the person who started this thread: http://www.mathworks.com/matlabcentral/answers/59039-trouble-with-finding-appropriate-conditions-for-logic where he found his model.

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ChristianW 2013-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/67062-apollo-capsule-3d-model#answer_78546

在 MATLAB Online 中打开

doc patch

Depending on your model complexity, you could use 3D CAD software and save as *.stl. There's a function called rndread, converting stl to patch input.

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resh 2013-3-18

Thank you. That looks very much like what I am expecting it to. I have a question. How did you approximate those values to get a shape as such? If you let me know the method that you used, then I could approximate the values for myself. Thanks once again.

ChristianW 2013-3-18

在 MATLAB Online 中打开

I made the shape with ginput and polyfit, but thats fast and dirty.

axes; disp('Define shape with 20 Mouseclicks or press Return.')
[x,y] = ginput(20);
plot(x,y,'.k'), hold on
p = polyfit(x,y,6);
X = linspace(0,1,100);
Y = polyval(p,X); % roots(p) for the Polynomial roots
plot(X,Y,'r'); axis([0 1 0 1])

As I said, you should use the exact profile form. That is like a big circle than a small circle, a straight line and a small circle. At each transition the gradients are the same.

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