IfcAdvancedBrep modelisation strategy?

RaphaëlVouilloz

Hello,
I wonder if Brep can be modeled in Bonsai?
More generally, since Blender is not intended for exact geometry, I wonder what strategy to adopt about this? Model Brep in Freecad? This would be a good use case using both software on the same IFC file?
I'm thinking of complex geometries in HBIM, sometimes tessellations is fine, but sometimes you want Breps.
Thanks

JanF

Sverchok supports this (through FreeCAD):
https://nortikin.github.io/sverchok/docs/solids.html
But as far as I can tell, IfcSverchok only supports creating meshes in ifc, so this is still missing.

bernd

https://community.osarch.org/discussion/comment/15096

RaphaëlVouilloz

Thanks @bernd
Really interesting!
Speckle has an interesting approach where breps embed both the brep geometric data and the mesh representation computed by the software : in any of exact geometry software as Freecad, both exist as mesh is the only thing you can visualize. When the receiving tool cannot recompute the brep, it uses the mesh.
Maybe an approach of native ifc could be to embed a tessellation too, to ensure visualization in any viewer, but prevent to edit it with mesh tools saying it depends on the brep representation and has to be edited in a relevant software.