https://github.com/ssg-aero/gbs

gbs is a c++ header library to build and manage NURBS, some optional module are used for visualization and export. This library is compatible with OpenCASACADE and has a python biding.
https://github.com/ssg-aero/gbs

bspline bspline-surface cad curve-surface-intersection gbs geometric-shapes loft nurbs opencascade

Last synced: 2 months ago
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gbs is a c++ header library to build and manage NURBS, some optional module are used for visualization and export. This library is compatible with OpenCASACADE and has a python biding.

• Host: GitHub
• URL: https://github.com/ssg-aero/gbs
• Owner: ssg-aero
• License: other
• Created: 2020-09-30T11:10:47.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2026-03-25T07:53:16.000Z (2 months ago)
• Last Synced: 2026-03-25T13:31:25.370Z (2 months ago)
• Topics: bspline, bspline-surface, cad, curve-surface-intersection, gbs, geometric-shapes, loft, nurbs, opencascade
• Language: C++
• Homepage: http://www.ssg-aero.com
• Size: 5.34 MB
• Stars: 45
• Watchers: 9
• Forks: 16
• Open Issues: 1
• Metadata Files:
  • Readme: ReadMe.md
  • Changelog: News.md
  • License: LICENSE.LGPLv3

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README

          
GBS is header library for computing bspline curves and surfaces.

GBS is compatible with OpenCASCADE, curves and surfaces can be converted to OpenCASCADE's objects.

__Example of point cloud approximation:__

![Screencast](img/foilApproximation.png)

__Example of points surface interpolation:__

![Screencast](img/pointSurfInterp.png)

__Example of curve-surface intersection:__

![Screencast](img/curve_surface_intersection.png)

__Example of loft-surface creation:__

![Screencast](img/loft.png)

__Example of surface approximation of points:__

![Screencast](img/surf_approx.png)

__Example of curve 2d variable offset:__

![Screencast](img/offset2d.png)

![Screencast](img/foil_offset.png)

__Example of curve on surface:__

![Screencast](img/curves_on_surface.png)

__Example of python code to interpolate points__

```python

    pts = [

        [0.,0.,0],

        [0.,0.,1],

        [1.,0.,0.5],

        [1.,1.,1]

    ]

    constraints = []

    for p in pts:

        constraints.append([p])

    degree = 2

    crv = gbs.interpolate_cn_3d_d(

        constraints,

        degree,

        gbs.KnotsCalcMode.CHORD_LENGTH

    )

```

For now, this lib is to be used inside a conda environment with the following package installed:

* nlopt 

* eigen3

* boost >= 1.74

The optional module gbs-occt requires the additional package:

* occt >=7.4.0

The optional module render requires the additional package:

* vtk >=9.0

The python bindings requires the additional package:

* pybind11

The test library needs:

* gtest

* occt>=7.4.0

* sundials

For efficient buid use:

``` bash

rattler-build build --recipe .\gbs\recipe\recipe.yaml -c ssg-aero -c conda-forge

```

**Warning tests relative to performances evaluation should be run in release mode**

As GBS base is a header library it doesn’t need compilation.

If one needs to compile the optional module gbs-occt, -DUSE_OCCT_UTILS:BOOL=TRUE shall be added to cmake command.

If one needs to compile the optional module render, -DUSE_RENDER:BOOL=TRUE shall be added to cmake command.

If one needs to compile the optional module python-bindings, -DUSE_PYTHON_BINDINGS=TRUE shall be added to cmake command.

The full test suite, which require the optional module gbs-occt, please add -DGBS_BUILD_TESTS:BOOL=TRUE to the cmake command.