MatlabTools(1)mesh2tri

mutougeda

将结构的四边形网格转换为三角形网格。
6 K2 d7 ^5 C! F* B$ h4 ^Demo:
  ^+ U6 f# G+ l* {7 d) sclear all; close all; clc;

% 1. Create mesh grid
[X,Y] = meshgrid(linspace(-10,10,25));
Z = sinc(sqrt((X/pi).^2+(Y/pi).^2));
figure('units','normalized','Position',[0 0 1 1],'Color','w'); colordef('white');
; B$ u( K1 ]& U. g% E
% 2. Plot the original rectangular mesh
subplot(2,2,1);
/ Y# M- R* d# r' M1 M9 TsuRF(X,Y,Z); hold on;
$ v$ L) Z( \  q, o9 O& m5 Daxis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Meshgrid','FontSize',20);
. H% Z& O4 ^, u) g
%3.1 forward slash division of quadrilateral
1 U/ L  z, c" e( Q1 x% L9 i, {
[F,V]=mesh2tri(X,Y,Z,'f');
C=V(:,3); C=mean(C(F),2);
subplot(2,2,2);
7 I) d# o7 P# k) b4 x; w5 tpatch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
axis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Forward slash','FontSize',20);
! m( I9 I( G! [. r1 c
%%3.2  back slash division of quadrilateral
[F,V]=mesh2tri(X,Y,Z,'b');
7 i7 q0 R  D- P) v3 a0 \/ _C=V(:,3); C=mean(C(F),2);
subplot(2,2,3);
%Example of using original meshgrid coordinates instead
- x7 P' G) G: a5 }3 f* D6 Utrisurf(F,X,Y,Z);
6 o( Y! g% `8 y+ m9 P! {axis tight; axis square; grid on; axis off; axis off; view(3); view(-30,70);
title('Back slash','FontSize',20);
& p" k. c; \% h& X
9 p$ t( M6 _0 l. {( V* _/ g%%3.3  Cross division of quadrilateral
1 @  c1 D) _1 D( n* q1 ~% r[F,V]=mesh2tri(X,Y,Z,'x');
" S) A: f6 D% b% Replace Z-coordinates of added points by interpolated values if desired
6 R% [8 x4 o& v$ T/ X% Z' _IND=(numel(X)+1):size(V,1);
ZI = interp2(X,Y,Z,V(IND,1),V(IND,2),'cubic');
/ ]3 H( `/ |" n$ s) O; m, _+ IV(IND,3)=ZI;
C=V(:,3); C=mean(C(F),2);
subplot(2,2,4);
8 A+ a: ~7 Z0 @/ W# V+ Opatch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
axis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Crossed','FontSize',20);
) c3 c+ N1 k5 A- v% D& \
; p7 B& X9 b- M; e$ c  u结果如下：

! r+ q5 s2 ]# j


; M4 H; \7 O; B; r% X9 h5 H

NingW

MatlabTools(1)mesh2tri