MatlabTools(1)mesh2tri

mutougeda

将结构的四边形网格转换为三角形网格。
Demo:
clear all; close all; clc;
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6 `5 p( m& r: D% 1. Create mesh grid
[X,Y] = meshgrid(linspace(-10,10,25));
% Z" y$ L$ O( v; Z) _  Y* v4 ]Z = sinc(sqrt((X/pi).^2+(Y/pi).^2));
figure('units','normalized','Position',[0 0 1 1],'Color','w'); colordef('white');

% p. d$ f, P7 s0 s% ~% 2. Plot the original rectangular mesh
subplot(2,2,1);
suRF(X,Y,Z); hold on;
axis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Meshgrid','FontSize',20);

+ o% Z+ E7 c1 R: m4 s1 Y+ X9 u# z5 o%3.1 forward slash division of quadrilateral

' N3 e% r' S  T7 a1 Q[F,V]=mesh2tri(X,Y,Z,'f');
; u8 a+ P& E2 G4 M9 L% _4 M1 eC=V(:,3); C=mean(C(F),2);
subplot(2,2,2);
patch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
2 j8 D0 o( w2 S% _# |axis tight; axis square; grid on; axis off; view(3); view(-30,70);
9 g: b8 u8 B5 U! \% _- J2 {- btitle('Forward slash','FontSize',20);

- N4 d( {5 Z0 T* v%%3.2  back slash division of quadrilateral
5 \* |; U. S$ B; h& F[F,V]=mesh2tri(X,Y,Z,'b');
% c, [/ L' |; {6 s/ j3 ~  X2 CC=V(:,3); C=mean(C(F),2);
& k! D' C  g. B/ d3 Vsubplot(2,2,3);
%Example of using original meshgrid coordinates instead
trisurf(F,X,Y,Z);
8 R1 m6 P" @  U: A1 Z( Yaxis tight; axis square; grid on; axis off; axis off; view(3); view(-30,70);
4 R3 G, x* E1 Ftitle('Back slash','FontSize',20);

- |, ~4 T% a/ C. y%%3.3  Cross division of quadrilateral
[F,V]=mesh2tri(X,Y,Z,'x');
% Replace Z-coordinates of added points by interpolated values if desired
IND=(numel(X)+1):size(V,1);
ZI = interp2(X,Y,Z,V(IND,1),V(IND,2),'cubic');
7 r+ Y( q9 \4 m8 |' aV(IND,3)=ZI;
C=V(:,3); C=mean(C(F),2);
subplot(2,2,4);
! u- B# S7 K5 u  J! Apatch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
5 I5 `( ]& C0 ^3 S# r+ S; waxis tight; axis square; grid on; axis off; view(3); view(-30,70);
/ f: R! S: d: F5 J( N1 u% Stitle('Crossed','FontSize',20);

结果如下：
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  u3 A5 ~9 \; @/ T7 h

NingW

MatlabTools(1)mesh2tri