%%?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

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????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

?????目錄??????????0??2017-03-18?14:35??sanjiaowangge?qumian?chongjian

-----------?---------??----------?-----??----

??????????????1113547????????????????????4