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how can I generate a 3d surface object from 3d vertex extracted from a blender .ply?

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Fabricio Castro
Fabricio Castro on 11 Apr 2018
Answered: Cris LaPierre on 20 Mar 2020
I'm looking for a way to get the 3d vertex information extracted from a blender .ply file and generate a 3d closed surface object. I tried the following code:
%Load .ply file
ptCloud = pcread('monkey.ply');
%Acess the 3D vertex coordinates
coordinates=ptCloud.Location; x=double(coordinates(:,1)); y=double(coordinates(:,2)); z=double(coordinates(:,3));
%Generate a delaunay triangulation from 3d vertex coordinates
DT = delaunayTriangulation(x,y,z);
[T,Xb] = freeBoundary(DT); TR = triangulation(T,Xb);
P = incenter(TR); F = faceNormal(TR);
trisurf(T,Xb(:,1),Xb(:,2),Xb(:,3), ... 'FaceColor','cyan','faceAlpha',0.8); axis equal hold on quiver3(P(:,1),P(:,2),P(:,3), ... F(:,1),F(:,2),F(:,3),0.5,'color','r');
The result related to the above code is represented by the attached figure (a), but the desired result would be (b).

Answers (1)

Cris LaPierre
Cris LaPierre on 20 Mar 2020
Does it have to be a ply file? If you can export it as an stl file, the following code might meet your needs.
mnky = stlread("monkey.stl");
trimesh(mnky,'facecolor', 'b','edgecolor','b')

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