About VTKFortran

VTKFortran is a pure Fortran 2003+ library for writing (and reading) data files conforming the VTK standard. It is not a wrapper around the VTK C++ source — it is an independent, pure-Fortran exporter/importer of the VTK data format, designed for Fortran programmers who want to use VTK-based visualization tools (such as ParaView) without mixing languages.

Key properties:

• Pure Fortran 2003+ — no C or C++ dependencies
• Thread and processor safe — multiple files can be written concurrently under OpenMP or MPI
• Multiple output formats — ASCII, binary (Base64), and raw binary appended
• OOP design — a polymorphic xml_writer component is selected at runtime based on the chosen format

Why VTKFortran?

Fortran remains the language of choice for high-performance scientific computing. Many HPC codes produce large multi-dimensional arrays that need post-processing and visualization. The VTK XML format is the native input format for ParaView, one of the most widely used open-source visualization tools. VTKFortran provides a direct path from Fortran arrays to VTK XML files without leaving the Fortran ecosystem.

Authors

• Stefano Zaghi — @szaghi

Contributions are welcome — see the Contributing page.

Copyrights

VTKFortran is distributed under a multi-licensing system:

Use case	License
FOSS projects	GPL v3
Closed source / commercial	BSD 2-Clause
Closed source / commercial	BSD 3-Clause
Closed source / commercial	MIT

Anyone interested in using, developing, or contributing to VTKFortran is welcome — pick the license that best fits your needs.