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SubproblemParameters.h
load_gmsh.m 6.94 KiB
function mesh = load_gmsh(filename)
% Reads a mesh in msh format, version 1 or 2
% Copyright (C) 10/2007 R Lorphvre (r.lorphevre@ulg.ac.be)
% Based on load_gmsh supplied with gmsh-2.0 and load_gmsh2 from JP
% Moitinho de Almeida (moitinho@civil.ist.utl.pt)
% number of nodes in function of the element type
msh.NODES_PER_TYPE_OF_ELEMENT = [
2 3 4 4 8 6 5 3 6 9 10 27 18 14 1 8 20 15 13 ];
% The format 2 don't sort the elements by reg phys but by
% reg-elm. If this classification is important for your program,
% use this (after calling this function):
%
% [OldRowNumber, NewRowNumber] = sort(OldMatrix(:,SortColumn));
% NewMatrix = OldMatrix(NewRowNumber,:);
%
% Change the name of OldMatrix and NewMatrix with the name of yours
% SortColumn by the number of the last column
mesh = [];
mesh.MIN = zeros(3, 1);
mesh.MAX = zeros(3, 1);
fid = fopen(filename, 'r');
disp (' ')
while 1
endoffile = 0;
while 1
tline = fgetl(fid);
if feof(fid), endoffile=1, break, end
if (tline(1) == '$' )
if tline(2) == 'N' && tline(3) == 'O'
fileformat = 1 ;
break
end
if tline(2) == 'M' && tline(3) == 'e'
fileformat = 2;
tline = fgetl(fid);
disp('Mesh Type')
disp (tline)
tline = fgetl(fid);
if (tline(1) == '$' && tline(2) == 'E'&& tline(3) == 'n')
tline = fgetl(fid);
break
else
disp (' This program can only read ASCII mesh file')
disp (' of format 1 or 2 from GMSH, try again?')
endoffile=1
break
end
end
if tline(2) == 'E' && (tline(3) == 'L' || tline(3) == 'l' )
break
end
end
end
if endoffile == 1, break, end
if tline(2) == 'N' && ( tline(3) == 'O' || tline(3) == 'o' )
disp('reading nodes')
mesh.nbNod = fscanf(fid, '%d', 1);
mesh.POS = zeros(mesh.nbNod, 3);
for(I=1:mesh.nbNod)
iNod = fscanf(fid, '%d', 1);
X = fscanf(fid, '%g', 3);
IDS(iNod) = I;
if (I == 1)
mesh.MIN = X;
mesh.MAX = X;
else
if(mesh.MAX(1) < X(1)) mesh.MAX(1) = X(1); end
if(mesh.MAX(2) < X(2)) mesh.MAX(2) = X(2); end
if(mesh.MAX(3) < X(3)) mesh.MAX(3) = X(3); end
if(mesh.MIN(1) > X(1)) mesh.MIN(1) = X(1); end
if(mesh.MIN(2) > X(2)) mesh.MIN(2) = X(2); end
if(mesh.MIN(3) > X(3)) mesh.MIN(3) = X(3); end
end
mesh.POS(I, 1) = X(1);
mesh.POS(I, 2) = X(2);
mesh.POS(I, 3) = X(3);
end
tline = fgetl(fid);
disp('nodes have been read')
elseif tline(2) == 'E' && ( tline(3) == 'L' || tline(3) == 'l')
disp('reading elements')
mesh.nbElm = fscanf(fid, '%d', 1);
if (fileformat == 1)
nbinfo = 5;
tags = 3;
end
if (fileformat == 2)
nbinfo = 4;
tags = 4;
end
mesh.ELE_INFOS = zeros(mesh.nbElm, nbinfo);
mesh.nbPoints = 0;
mesh.nbLines = 0;
mesh.nbTriangles = 0;
mesh.nbQuads = 0;
mesh.nbTets = 0;
mesh.nbHexas = 0;
mesh.nbPrisms = 0;
mesh.nbPyramids = 0;
% comment next 8 lines to get "tight" arrays (will slow down reading)
mesh.POINTS = zeros(mesh.nbElm, 2);
mesh.LINES = zeros(mesh.nbElm, 3);
mesh.TRIANGLES = zeros(mesh.nbElm, 4);
mesh.QUADS = zeros(mesh.nbElm, 5);
mesh.TETS = zeros(mesh.nbElm, 5);
mesh.HEXAS = zeros(mesh.nbElm, 9);
mesh.PRISMS = zeros(mesh.nbElm, 7);
mesh.PYRAMIDS = zeros(mesh.nbElm, 6);
for(I = 1:mesh.nbElm)
mesh.ELE_INFOS(I, :) = fscanf(fid, '%d', nbinfo);
if (fileformat == 1)
% take the mesh.ELE_INFOS(I, 5) nodes of the element
NODES_ELEM = fscanf(fid, '%d', mesh.ELE_INFOS(I, 5));
end
if (fileformat == 2)
mesh.ELE_TAGS(I,:) = fscanf(fid, '%d', (mesh.ELE_INFOS(I,3)-1));
% take the msh.NODES_PER_TYPE_OF_ELEMENT (mesh.ELE_INFOS(I, 2)) nodes of the element
NODES_ELEM = fscanf(fid, '%d', msh.NODES_PER_TYPE_OF_ELEMENT (mesh.ELE_INFOS(I, 2)) );
end
if(mesh.ELE_INFOS(I, 2) == 15) %% point
mesh.nbPoints = mesh.nbPoints + 1;
mesh.POINTS(mesh.nbPoints, 1) = IDS(NODES_ELEM(1));
mesh.POINTS(mesh.nbPoints, 2) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 1) %% line
mesh.nbLines = mesh.nbLines + 1;
mesh.LINES(mesh.nbLines, 1) = IDS(NODES_ELEM(1));
mesh.LINES(mesh.nbLines, 2) = IDS(NODES_ELEM(2));
mesh.LINES(mesh.nbLines, 3) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 2) %% triangle
mesh.nbTriangles = mesh.nbTriangles + 1;
mesh.TRIANGLES(mesh.nbTriangles, 1) = IDS(NODES_ELEM(1));
mesh.TRIANGLES(mesh.nbTriangles, 2) = IDS(NODES_ELEM(2));
mesh.TRIANGLES(mesh.nbTriangles, 3) = IDS(NODES_ELEM(3));
mesh.TRIANGLES(mesh.nbTriangles, 4) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 3) %% quadrangle
mesh.nbQuads = mesh.nbQuads + 1;
mesh.QUADS(mesh.nbQuads, 1) = IDS(NODES_ELEM(1));
mesh.QUADS(mesh.nbQuads, 2) = IDS(NODES_ELEM(2));
mesh.QUADS(mesh.nbQuads, 3) = IDS(NODES_ELEM(3));
mesh.QUADS(mesh.nbQuads, 4) = IDS(NODES_ELEM(4));
mesh.QUADS(mesh.nbQuads, 5) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 4) %% tetrahedron
mesh.nbTets = mesh.nbTets + 1;
mesh.TETS(mesh.nbTets, 1) = IDS(NODES_ELEM(1));
mesh.TETS(mesh.nbTets, 2) = IDS(NODES_ELEM(2));
mesh.TETS(mesh.nbTets, 3) = IDS(NODES_ELEM(3));
mesh.TETS(mesh.nbTets, 4) = IDS(NODES_ELEM(4));
mesh.TETS(mesh.nbTets, 5) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 5) %% hexahedron
mesh.nbHexas = mesh.nbHexas + 1;
mesh.HEXAS(mesh.nbHexas, 1) = IDS(NODES_ELEM(1));
mesh.HEXAS(mesh.nbHexas, 2) = IDS(NODES_ELEM(2));
mesh.HEXAS(mesh.nbHexas, 3) = IDS(NODES_ELEM(3));
mesh.HEXAS(mesh.nbHexas, 4) = IDS(NODES_ELEM(4));
mesh.HEXAS(mesh.nbHexas, 5) = IDS(NODES_ELEM(5));
mesh.HEXAS(mesh.nbHexas, 6) = IDS(NODES_ELEM(6));
mesh.HEXAS(mesh.nbHexas, 7) = IDS(NODES_ELEM(7));
mesh.HEXAS(mesh.nbHexas, 8) = IDS(NODES_ELEM(8));
mesh.HEXAS(mesh.nbHexas, 9) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 6) %% prism
mesh.nbPrisms = mesh.nbPrisms + 1;
mesh.PRISMS(mesh.nbPrisms, 1) = IDS(NODES_ELEM(1));
mesh.PRISMS(mesh.nbPrisms, 2) = IDS(NODES_ELEM(2));
mesh.PRISMS(mesh.nbPrisms, 3) = IDS(NODES_ELEM(3));
mesh.PRISMS(mesh.nbPrisms, 4) = IDS(NODES_ELEM(4));
mesh.PRISMS(mesh.nbPrisms, 5) = IDS(NODES_ELEM(5));
mesh.PRISMS(mesh.nbPrisms, 6) = IDS(NODES_ELEM(6));
mesh.PRISMS(mesh.nbPrisms, 7) = mesh.ELE_INFOS(I, tags);
end
if(mesh.ELE_INFOS(I, 2) == 7) %% pyramid
mesh.nbPyramids = mesh.nbPyramids + 1;
mesh.PYRAMIDS(mesh.nbPyramids, 1) = IDS(NODES_ELEM(1));
mesh.PYRAMIDS(mesh.nbPyramids, 2) = IDS(NODES_ELEM(2));
mesh.PYRAMIDS(mesh.nbPyramids, 3) = IDS(NODES_ELEM(3));
mesh.PYRAMIDS(mesh.nbPyramids, 4) = IDS(NODES_ELEM(4));
mesh.PYRAMIDS(mesh.nbPyramids, 5) = IDS(NODES_ELEM(5));
mesh.PYRAMIDS(mesh.nbPyramids, 6) = IDS(NODES_ELEM(6));
mesh.PYRAMIDS(mesh.nbPyramids, 7) = mesh.ELE_INFOS(I, tags);
end
end
tline = fgetl(fid);
disp('elements have been read')
end
end
fclose(fid);