function make_plt_3Dbrick_disp(filename,V,MESH,u)
num_ele=size(MESH,1);
num_nod=size(V,1);
% OUTP1=zeros(6,num_nod);
idx_x=1:3:num_nod*3;
idx_y=2:3:num_nod*3;
idx_z=3:3:num_nod*3;
X=u(idx_x);
Y=u(idx_y);
Z=u(idx_z);
OUTP1=[V,X,Y,Z].';
% for inode=1:num_nod
%     x=V(inode,1);y=V(inode,2);z=V(inode,3);
%     OUTP1(:,inode)=[x;y;z;u(inode*3-2);u(inode*3-1);u(inode*3)];
% %     fprintf(fileID,'%f %f %f %f %f %f\n',x,y,z,u(inode*3-2),u(inode*3-1),u(inode*3));
% end

OUTP2=MESH.';
disp('start writing----------------')
fileID=fopen([filename,'.plt'],'w');
fprintf(fileID,'TITLE="FE Solution"\n');
fprintf(fileID,'VARIABLES = "X", "Y", "Z","u","v","w"\n');
fprintf(fileID,'ZONE NODES=%d, ELEMENTS=%d, DATAPACKING=POINT, ZONETYPE=FEBRICK\n',num_nod,num_ele);
fprintf(fileID,'%f %f %f %f %f %f\n',OUTP1);
fprintf(fileID,'%d %d %d %d %d %d %d %d\n',OUTP2);
fclose(fileID);
end