reducepatch function with stl file

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nourdine ouzoubair
nourdine ouzoubair 2016-7-28
编辑： DGM 2025-7-16
How can I use reducepatch function with stl file?? Thank you

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回答（1 个）

Rahul
Rahul 2025-6-4
Hi @nourdine ouzoubair,
In order to use 'reducepatch' function with an stl file, consider the following steps:
  • Read the stl file using 'stlread' function.
  • You would obtain a Triagulation object which would contain 'ConnectivityList' and 'Points'
  • Either construct a struct with properties 'faces', 'vertices', where 'faces' would crrespond to 'ConnectivityList' and 'vertices' would correspond to 'Points' of the Triangulation object.
  • You can also consider creating a 'patch' object with the 'ConnectivityList' and 'Points' as 'Faces' and 'Vertices'.
  • This struct or 'patch' object created can be passed to the 'reducepatch' function with appropriate arguments.
The following MathWorks documentations can be referred:
'stlread': https://www.mathworks.com/help/matlab/ref/stlread.html
'patch': https://www.mathworks.com/help/matlab/ref/patch.html
'reductpatch': https://www.mathworks.com/help/matlab/ref/reducepatch.html
Thanks.
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DGM
DGM 2025-7-16
编辑：DGM 2025-7-16
Ran in:
How about an example?
unzip sphere_200.stl.zip % for the forum
% read the file
T = stlread('sphere_200.stl'); % triangulation object
% convert to an FV struct
FV = t2fv(T);
size(FV.faces,1)
ans = 39996
patch(FV,'facecolor',[0.2 0.8 1],'edgecolor','none');
view(3); view(-30,47); camlight;
axis equal; grid on
% reduce the model to 10% of the facecount
FVr = reducepatch(FV,0.1);
size(FVr.faces,1)
ans = 3998
patch(FVr,'facecolor',[0.2 0.8 1],'edgecolor','none');
view(3); view(-30,47); camlight;
axis equal; grid on
My use of t2fv() here is both a convenience and an anachronism. In 2016, we wouldn't be reading into triangulation objects. The first-party stlread() didn't exist until late 2018. The available third party decoders would have been returning data as an FV struct, separate F,V lists, or other less useful formats. As a consequence, we would likely need to do nothing extra to obtain the FV struct.

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