Note: This is a fork from Lib_VTK_IO, made by Stefano Zaghi. The main purpose of this fork is to add reading capabilities to the library by taking as starting point the previous work of Francisco Pena.

A KISS pure Fortran Library to IO data conforming the VTK standard

• Lib_VTK_IO is a pure Fortran library to write and read data conforming the VTK standard;
• Lib_VTK_IO is Fortran 2003+ standard compliant;
• Lib_VTK_IO supports parallel architectures by means OpenMP and MPI paradigms;
• Lib_VTK_IO supports ascii, binary and base64 file formats;
• Lib_VTK_IO is a Free, Open Source Project.

The Lib_VTK_IO is an open source project, it is distributed under a dual licensing system: the GPL v3 and the MIT licenses. Anyone is interest to use, to develop or to contribute to Lib_VTK_IO is welcome: you are free to select the GPL license for FOSS projects or the MIT one for commercial softwares.

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Lib_VTK_IO has a comprehensive wiki. Moreover, the API is well documented, on the GitHub pages of the project.

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Let us assume our aim being to save our pure Fortran data into a VTK structured grid file in binary XML form. This is simple as

USE Lib_VTK_IO
...
! dataset dimensions
integer, parameter:: nx1=0,nx2=9,ny1=0,ny2=5,nz1=0,nz2=5
integer, parameter:: nn=(nx2-nx1+1)*(ny2-ny1+1)*(nz2-nz1+1)
! grid coordinates
real, dimension(nx1:nx2,ny1:ny2,nz1:nz2):: x,y,z
! variables associated at grid nodes
real, dimension(nx1:nx2,ny1:ny2,nz1:nz2):: v_R
! auxiliary variables
integer:: E_IO
...
E_IO = VTK_INI_XML(output_format='binary',filename='XML_STRG.vts',mesh_topology='StructuredGrid',nx1=nx1,nx2=nx2,ny1=ny1,ny2=ny2,nz1=nz1,nz2=nz2)
E_IO = VTK_GEO_XML(nx1=nx1,nx2=nx2,ny1=ny1,ny2=ny2,nz1=nz1,nz2=nz2,NN=nn,X=x,Y=y,Z=z)
E_IO = VTK_DAT_XML(var_location='node',var_block_action='open')
E_IO = VTK_VAR_XML(NC_NN=nn,varname='real scalar',var=v_R)
E_IO = VTK_DAT_XML(var_location='node',var_block_action='close')
E_IO = VTK_GEO_XML()
E_IO = VTK_END_XML()

Note that all Lib_VTK_IO functions return an error code (E_IO) that can be used for sophisticated error trapping algorithms.