read_wrl(filename)

function [vertex, face] = read_wrl(filename)

% read_wrl - load a mesh from a VRML file
%
%   [vertex, face] = read_wrl(filename);
%
%   Copyright (c) 2004 Gabriel Peyr

fp = fopen(filename,'r');
if fp == -1
    fclose all;
    error(['Cannot open file ' filename]);
end

tempstr = ' ';

key = 'point [';
vertex = [];

while ( tempstr ~= -1)
    tempstr = fgets(fp);   % -1 if eof
    if( ~isempty(findstr(tempstr,key)) )
        [vertex,nc] = fscanf(fp,'%f%c %f%c %f%c', Inf);
        
        vertex = reshape(vertex, [6,length(vertex)/6]);
        vertex([2 4 6],:) = [];
        
        if 0 %% old code
        nc = 3;
        while nc>0
            tempstr = fgets(fp);   % -1 if eof
            [cvals,nc] = sscanf(tempstr,'%f %f %f,');
            if nc>0
                if mod(nc,3)~=0
                    error('Not correct WRL format');
                end
                vertex = [vertex, reshape(cvals, 3, nc/3)];
            end
        end
        end
        
        break;
    end
end

if nargout==1
    return;
end

key = 'coordIndex [';
face = [];

while ( tempstr ~= -1)
    tempstr = fgets(fp);   % -1 if eof
    if( ~isempty(findstr(tempstr,key)) )
        
        % should work with , and space separators
        [face,nc] = fscanf(fp,'%d%c %d%c %d%c -1%c', Inf);
        face = reshape(face, [7,length(face)/7])+1;
        face([2 4 6 7],:) = [];
        
        if 0 %% old code
        nc = 3;
        while nc>0
            tempstr = fgets(fp);   % -1 if eof
            [cvals,nc] = sscanf(tempstr,'%d %d %d -1,');
            if nc==0 || mod(nc,3)~=0
                [cvals,nc] = sscanf(tempstr,'%d, %d, %d, -1,');
            end
            if nc>0
                face = [face, reshape(cvals, 3, nc/3)+1];
            end
        end
        end 
        
        fclose(fp);
        return;
    end
end