colmap/scripts/matlab/write_ply.m

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% Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)

function write_ply(path, xyz, normals, rgb)
% Write point cloud to PLY text file.

file = fopen(path, 'W');

fprintf(file,'ply\n');
fprintf(file,'format ascii 1.0\n');
fprintf(file,'element vertex %d\n',size(xyz,1));
fprintf(file,'property float x\n');
fprintf(file,'property float y\n');
fprintf(file,'property float z\n');
fprintf(file,'property float nx\n');
fprintf(file,'property float ny\n');
fprintf(file,'property float nz\n');
fprintf(file,'property uchar diffuse_red\n');
fprintf(file,'property uchar diffuse_green\n');
fprintf(file,'property uchar diffuse_blue\n');
fprintf(file,'end_header\n');

for i = 1:size(xyz, 1)
    fprintf(file, '%f %f %f %f %f %f %d %d %d\n', ...
        xyz(i,1), xyz(i,2), xyz(i,3), ...
        normals(i,1), normals(i,2), normals(i,3), ...
        uint8(rgb(i,1)), uint8(rgb(i,2)), uint8(rgb(i,3)));
end

fclose(file);

end