资源简介
使用matlab实现三维建模源码,效果非常好,可以用于三维点云数据的建模-Three-dimensional modeling using MATLAB
代码片段和文件信息
%% MyCrust
%
%Simple surface recostruction program based on Crust algorithm Given a set
% of 3D points returns a triangulated tight surface.
%
%The more points there are the best the surface will be fitted although
% you will have to wait more. For very large models an help memory errors
% may occurs. It is important even the point distribution generally
% uniformly distributed points with denser zones in high curvature features
% give the best results.
%
%Remember crust algorithom needs a cloud representing a VOLUME so open
% surface may give inaccurate results. Surface with small holes are not
% considered open surface and generally are processed well.
%
%
% If any problems occurs in execution or if you found a bug have a
% suggestion or question just contact me at:
%
% giaccariluigi@msn.com
%
%
%
%
%Here is a simple example:
%
%load Dino.mat%load input points from mat file
%
%[t]=MyCrust(p);
%
% figure(1)
% hold on title(‘Output Triangulation‘‘fontsize‘14) axis equal
% trisurf(tp(:1)p(:2)p(:3)‘facecolor‘‘c‘‘edgecolor‘‘b‘)
%
%Input:
% p is a Nx3 array containing the 3D set of points
%Output:
% t are points id contained in triangles nx3 array .
%
% See also qhull voronoin convhulln delaunay delaunay3 tetramesh.
%
%Author:Giaccari Luigi
%Last Update: 03/1/2008
%Created: 10/10/2008
function [t]=MyCrust(p)
%error check
if nargin>1
error(‘The only input must be the Nx3 array of points‘);
end
[n]=size(p2);
if n ~=3
error(‘Input 3D points must be stored in a Nx3 array‘);
end
clear n
%% Main
starttime=clock;
%add points to the given ones this is usefull
%to create outside tetraedroms
tic
[pnshield]=AddShield(p);
fprintf(‘Added Shield: %4.4f s\n‘toc)
tic
tetr=delaunayn(p);%creating tedraedron
tetr=int32(tetr);%use integer to save memory
fprintf(‘Delaunay Triangulation Time: %4.4f s\n‘toc)
%connectivity data
%find triangles to tetraedrom and tetraedrom to triangles connectivity data
tic
[t2tetrtetr2tt]=Connectivity(tetr);
fprintf(‘Connectivity Time: %4.4f s\n‘toc)
tic
[ccr]=CC(ptetr);%Circumcenters of tetraedroms
fprintf(‘Circumcenters Time: %4.4f s\n‘toc)
clear n
tic
tbound=Marking(ptetrtetr2tt2tetrccrnshield);%Flagging tetraedroms as inside or outside
fprintf(‘Walking Time: %4.4f s\n‘toc)
%recostructed raw surface
t=t(tbound:);
time=etime(clockstarttime);
fprintf(‘Total Time: %4.4f s\n‘time)
end
%% Circumcenters
function [ccr]=CC(ptetr)
%finds circumcenters from a set of tetraedroms
%points of tetraedrom
p1=(p(tetr(:1):));
p2=(p(tetr(:2):));
p3=(p(tetr(:3):));
p4=(p(tetr(:4):));
%vectors of tetraedrom edges
v21=p(tetr(:1):)-p(tetr(:2):);
v31=p(tetr(:3):)-p(tetr(:1):);
v41=p(tetr(:4):)-p(tetr(:1):);
%preallocation
cc=zeros(size(tetr1)3);
%Solve the system using cramer method
d1=s
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 1100582 2008-11-20 18:13 sanjiaowangge qumian chongjian\Chair.mat
文件 12438 2009-02-09 17:48 sanjiaowangge qumian chongjian\MyCrust.m
文件 527 2017-03-18 14:35 sanjiaowangge qumian chongjian\TestMyCrust.m
目录 0 2017-03-18 14:35 sanjiaowangge qumian chongjian
----------- --------- ---------- ----- ----
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