MatlabTools(1)mesh2tri

mutougeda

将结构的四边形网格转换为三角形网格。
# P1 }6 T& r* G/ s8 eDemo:
2 ^. Q0 v. v+ l( L% Yclear all; close all; clc;

% 1. Create mesh grid
[X,Y] = meshgrid(linspace(-10,10,25));
. X& |* S5 n" r( M' r& jZ = sinc(sqrt((X/pi).^2+(Y/pi).^2));
figure('units','normalized','Position',[0 0 1 1],'Color','w'); colordef('white');
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% 2. Plot the original rectangular mesh
subplot(2,2,1);
( ]9 i! a& ~/ x9 O3 WsuRF(X,Y,Z); hold on;
) |3 Y, D1 h& D0 `/ x- Daxis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Meshgrid','FontSize',20);
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%3.1 forward slash division of quadrilateral

[F,V]=mesh2tri(X,Y,Z,'f');
C=V(:,3); C=mean(C(F),2);
subplot(2,2,2);
patch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
axis tight; axis square; grid on; axis off; view(3); view(-30,70);
% ]1 ~7 ?1 O; Y" `9 ntitle('Forward slash','FontSize',20);

# T1 {* P7 M' X& p- y$ t& Z% m%%3.2  back slash division of quadrilateral
/ u, }1 |, w7 ]! v- ]# i% T2 g[F,V]=mesh2tri(X,Y,Z,'b');
C=V(:,3); C=mean(C(F),2);
subplot(2,2,3);
2 C4 `+ B" Q5 Q+ H5 H' K%Example of using original meshgrid coordinates instead
trisurf(F,X,Y,Z);
. q0 z# |0 v+ w% C' n3 B$ G) U' ^axis tight; axis square; grid on; axis off; axis off; view(3); view(-30,70);
title('Back slash','FontSize',20);
% p/ }4 O4 _) I! p( P& h
6 a7 s% O4 |6 [& H/ V. }9 \! c# ]- F%%3.3  Cross division of quadrilateral
[F,V]=mesh2tri(X,Y,Z,'x');
% Replace Z-coordinates of added points by interpolated values if desired
# c6 S9 U" q7 T7 t( {$ xIND=(numel(X)+1):size(V,1);
2 y: \, Q& g1 S( zZI = interp2(X,Y,Z,V(IND,1),V(IND,2),'cubic');
3 v9 F; M; d  G& w) cV(IND,3)=ZI;
C=V(:,3); C=mean(C(F),2);
subplot(2,2,4);
* G! j  M  }0 `4 jpatch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
+ s( N. V7 T4 W5 {: [axis tight; axis square; grid on; axis off; view(3); view(-30,70);
, U! _0 W/ i! x3 Vtitle('Crossed','FontSize',20);

结果如下：
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# V4 @0 X* Y) r4 p7 Q$ j6 T% r7 `; z9 B5 f

% ~7 G3 {2 f: `0 Z! Q& W) y1 L$ n9 ^) J

NingW

MatlabTools(1)mesh2tri