Hi Stephen, We currently only create trimmed patches indirectly, e.g. through boolean operations.
It would indeed be nice to expose an interface for building trimmed surfaces directly. I guess the most natural way would be to specify wires of curves defined in the parametric space of the surface? We would need to think a bit about how to design the api, since in Gmsh we only expose the creation of 3D curves. Christophe > On 26 Nov 2020, at 07:07, Banks, Stephen (Energy, Clayton North) > <stephen.ba...@csiro.au> wrote: > > Hello, > > How do I construct trimmed NURBS surfaces? > > In section F.4 of the documentation, point (1) states Gmsh supports trimmed > NURBS surface with the OpenCASCADE kernel. However, I am not able to work out > how construct them. I see the addBSplineSurface function, which I have > successfully used to construct a NURBS surface, but I don’t see how to trim > the resulting surface using curves. > > For background, I am developing an interface between Rhino3D and Gmsh using > the OpenNURBS library and the Gmsh API. This involves translating the > geometry from one representation to the other. This question is prompted by > me trying translate OpenNURBS Brep (boundary representation) geometrical > objects to Gmsh, which is a surface or polysurface with trim curve > information. > > Many thanks, > Stephen > _______________________________________________ > gmsh mailing list > gmsh@onelab.info > http://onelab.info/mailman/listinfo/gmsh — Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://people.montefiore.ulg.ac.be/geuzaine _______________________________________________ gmsh mailing list gmsh@onelab.info http://onelab.info/mailman/listinfo/gmsh
