ForCAD: A parallel Fortran library for geometric modeling using NURBS (Non-Uniform Rational B-Splines).

ForCAD supports B-Spline, NURBS, Bezier, and Rational Bezier curves, surfaces, and volumes.

• Parallelized using OpenMP and do concurrent.
• Create NURBS objects by specifying control points, weights and knots.
• Refine NURBS objects by inserting or removing knots and elevating degree.
• Compute basis functions and derivatives of NURBS objects.
• Obtain IGA elements connectivity.
• Obtain visualized elements connectivity and coordinates for geometry and control geometry.
• Mesh insertion into a NURBS object.
• Export NURBS objects to VTK files for visualization.
• Includes predefined NURBS shapes: Circle, Half Circle, Tetragon, Hexahedron, 2D Ring, Half 2D Ring, 3D Ring, Half 3D Ring, C-shapes.
• Rotate and translate NURBS objects.
• Visualization using provided python PyVista scripts.

• A Fortran compiler, such as GNU Fortran (gfortran), Intel Fortran Compiler (ifx/ifort) or NVIDIA HPC SDK Fortran compiler (nvfortran).
• The Fortran Package Manager fpm.
• Optional: PyVista (Recommended) or ParaView for visualization.

Clone the ForCAD repository from GitHub:

git clone https://github.com/gha3mi/forcad.git
cd forcad

To install PyVista, run the following command:

pip install pyvista

fpm run --example <file name excluding the .f90 extension>

After executing the examples, .vtk files will be generated in the vtk directory. To visualize these files, a show() method is provided which utilizes PyVista. Alternatively, other visualization tools like ParaView can also be used.

If you want to use ForCAD as a dependency in your own fpm project, you can easily include it by adding the following line to your fpm.toml file:

[dependencies]
forcad = {git="https://github.com/gha3mi/forcad.git"}

The most up-to-date API documentation for the master branch is available here. To generate the API documentation for ForCAD using ford run the following command:

ford ford.yml

For a detailed roadmap outlining upcoming features and enhancements, please refer to ROADMAP.md.

To contribute to ForCAD, please review the CONTRIBUTING.md.

If you use ForCAD in your research, please cite it as follows:

@software{seyed_ali_ghasemi_2024_10904447,
  author       = {Ghasemi, S. A.},
  title        = {gha3mi/ForCAD},
  year         = 2024,
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.10904447},
  url          = {https://doi.org/10.5281/zenodo.10904447}
}

• Piegl, L., & Tiller, W. (1995). The NURBS Book. In Monographs in Visual Communications. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-97385-7

• An Introduction to NURBS. (2001). Elsevier. https://doi.org/10.1016/b978-1-55860-669-2.x5000-3

• Sullivan et al., (2019). PyVista: 3D plotting and mesh analysis through a streamlined interface for the Visualization Toolkit (VTK). Journal of Open Source Software, 4(37), 1450, https://doi.org/10.21105/joss.01450

• Ahrens, James, Geveci, Berk, Law, Charles, ParaView: An End-User Tool for Large Data Visualization, Visualization Handbook, Elsevier, 2005, ISBN-13: 9780123875822