read .off file in matlab

OFF 文件格式如下：

OFF
441 800 0
0 0 0
0.05 0 0
0.1 0 0
0.15 0 0
...
0.9 1 0
0.95 1 0
1 1 0
3 0 1 22
3 0 22 21
...
3 397 398 419
3 397 419 418
3 418 419 440
3 418 440 439

matlab文件如下：

function [V,F,UV,C,N] = readOFF( filename )% READOFF reads an OFF file with vertex/face information%% [V,F,UV,C,N] = readOFF( filename )%% Input:%  filename  path to .obj file% Outputs:%  V  #V by 3 list of vertices%  F  #F by 3 list of triangle indices%  UV  #V by 2 list of texture coordinates%  C  #V by 3 list of colors%  N  #V by 3 list of normals%% See also: load_mesh, readOBJfast, readOBJ% (C) 2007 Denis Kovacs, NYU
%-------------------------------------------------------------------------V = [];F = [];UV = [];C = [];N = [];fp = fopen( filename, 'r' );OFFheader = upper(fscanf( fp, '%s\n', 1 ));if (OFFheader(end-2:end) ~= 'OFF') warning('no OFF file!'); return; endOFFdim = 3;OFF_N = 0; OFF_C=0; OFF_ST=0;if find(OFFheader=='N') OFFdim = OFFdim+3; OFF_N=1; endif find(OFFheader=='C') OFFdim = OFFdim+3; OFF_C=1; endif find(OFFheader=='S') OFFdim = OFFdim+2; OFF_ST=1; endd = fscanf( fp, '%d', 3);nV = d(1); nF = d(2); nE = d(3);disp(sprintf('  - Reading %d vertices', nV));switch OFFdimcase  3; OFFV = textscan( fp, '%f %f %f', nV);case  5; OFFV = textscan( fp, '%f %f %f %f %f', nV);case  6; OFFV = textscan( fp, '%f %f %f %f %f %f', nV);case  7; OFFV = textscan( fp, '%f %f %f %f %f %f %f', nV);case  8; OFFV = textscan( fp, '%f %f %f %f %f %f %f %f', nV);case  9; OFFV = textscan( fp, '%f %f %f %f %f %f %f %f %f', nV);case 10; OFFV = textscan( fp, '%f %f %f %f %f %f %f %f %f %f', nV);case 11; OFFV = textscan( fp, '%f %f %f %f %f %f %f %f %f %f %f', nV);otherwise; error('Unsupported number of vertex entries');endtryOFFV = cell2mat(OFFV); endOFFdim = 1;V = OFFV(:,OFFdim:(OFFdim+2)); OFFdim = OFFdim + 3;if (OFF_N) N = OFFV(:,OFFdim:(OFFdim+2)); OFFdim = OFFdim + 3; endif (OFF_C) C = OFFV(:,OFFdim:(OFFdim+2)); OFFdim = OFFdim + 3; endif (OFF_ST) UV = OFFV(:,OFFdim:(OFFdim+1)); OFFdim = OFFdim + 2; endif (nF ~= 0)disp(sprintf('  - Reading %d faces', nF));F = cell2mat( textscan( fp, '%d %d %d %d %d %d', nF ) );F =  double(F(:, 2:(F(1,1)+1) ) + 1 );elseF = [];enddisp('  - done.');
end

执行命令：

[V,F,UV,C,N] = readOFF( 'square_21.off' )

我们得到

- Reading 441 vertices
- Reading 800 faces
- done.

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read .off file in matlab

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