MatlabTools(1)mesh2tri

mutougeda

将结构的四边形网格转换为三角形网格。
3 k9 N! c6 l6 r. ?# XDemo:
clear all; close all; clc;

% 1. Create mesh grid
[X,Y] = meshgrid(linspace(-10,10,25));
% l' D  M' j6 H7 f2 V0 H- MZ = sinc(sqrt((X/pi).^2+(Y/pi).^2));
figure('units','normalized','Position',[0 0 1 1],'Color','w'); colordef('white');

% 2. Plot the original rectangular mesh
subplot(2,2,1);
suRF(X,Y,Z); hold on;
- c. |; u$ Z, k" z. C8 s0 naxis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Meshgrid','FontSize',20);

5 w" l  d: A. q( @- i%3.1 forward slash division of quadrilateral

7 }; y2 x% }+ N- G6 V! D/ y' h[F,V]=mesh2tri(X,Y,Z,'f');
C=V(:,3); C=mean(C(F),2);
  T; X9 y) n1 h1 t+ }0 \subplot(2,2,2);
- r) a" V+ n/ I8 apatch('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);
" Q- C9 S: X$ ~* F  B
4 n. O- c9 G+ }8 U6 H%%3.2  back slash division of quadrilateral
1 Y9 m9 b, K4 g[F,V]=mesh2tri(X,Y,Z,'b');
7 i; G9 G( n3 c+ U8 h9 M: h( mC=V(:,3); C=mean(C(F),2);
5 |3 q" s5 u* i  L) f  dsubplot(2,2,3);
8 i& P1 ]8 J$ z5 y1 ?. L' q* J%Example of using original meshgrid coordinates instead
trisurf(F,X,Y,Z);
! M6 @. A, p1 E( L" _$ N, t" D2 daxis tight; axis square; grid on; axis off; axis off; view(3); view(-30,70);
6 }$ v' T* z2 R9 p, ]! y# ]  _$ Ptitle('Back slash','FontSize',20);
* F1 l+ k2 |& X7 p' _1 w  n1 G
% B; r, D: q9 s* V) _6 ^%%3.3  Cross division of quadrilateral
4 `. W  a& Z  M/ J[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');
V(IND,3)=ZI;
, [' s6 |. M4 B* s1 JC=V(:,3); C=mean(C(F),2);
+ Y7 A6 s5 n" Psubplot(2,2,4);
8 _* H5 R' c2 ~" c" s& r. s; Ppatch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C); hold on;
% H, i2 M5 g% C' Z* J& Xaxis tight; axis square; grid on; axis off; view(3); view(-30,70);
title('Crossed','FontSize',20);
% U7 N' H* N4 K9 |0 q6 v
结果如下：

9 o  {* T# A3 i. }6 ~# q

NingW

MatlabTools(1)mesh2tri