How to remove a 3d-Surface matrix entries outside of a 2D area/Curve?

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Garvit Amipara 2021-6-8

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评论： Garvit Amipara 2021-6-11

Hello lovely Mathworks members,

( I tried to find similar question but could not find any, so excuse me if there is already existing answer please share the link)

There is a 3D surface matrix which has some entries outside of a curve area and I want to remove the 3D matrix entries outside of a 2D curve. Can someone please help to understand how to remove the outside of curve entries of the 3D matrix. In attachmnet you will find both 2D and 3D matrices.

Best Regards!

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采纳的回答

KSSV 2021-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/850585-how-to-remove-a-3d-surface-matrix-entries-outside-of-a-2d-area-curve#answer_719565

编辑：KSSV 2021-6-9

在 MATLAB Online 中打开

You hvae to use inpolygon. Read about it.

load('3D_XYZ_Data.mat') ;
load('2D_RestrictedArea.mat') ;
X = XYZ_Data(:,1) ; 
Y = XYZ_Data(:,2) ; 
Z = XYZ_Data(:,3) ; 
x = Restricted_Area(:,1) ; 
y = Restricted_Area(:,2) ; 
idx = inpolygon(X,Y,x,y) ; % get points lying inside the restricted points 
plot3(X(idx),Y(idx),Z(idx),'.r')
hold on
plot(x,y,'.b')
view(2)