How to convert a Handle(Geom_BSplineSurface) to Handle(Geom_Surface) ?

Fernando Ghedin
Sat, 07/22/2017 - 02:08

Forums:

Modeling Data and Algorithms

Hello everybody,

It seems that it used to be possible, but not anymore (I'm using OCCT 7.1.0).

Thank you!

Fernando

Forum supervisor
Mon, 07/24/2017 - 07:47

Hello Fernando,

This problem looks strange, because such conversion should be possible in all versions.

Can you share a piece of code that does not work?

Thanks in advance!

Forum supervisor

Fernando Ghedin
Mon, 07/24/2017 - 16:52

Hello,

The snippet is available here => https://gist.github.com/ghedin/c2481a6d255bd5d09f13561e8471490b

Maybe I'm missing something pretty basic, but as you can see, I'm just giving a Handle(Geom_BSplineSurface) to the BRepBuilderAPI_MakeFace constructor with this signature:

BRepBuilderAPI_MakeFace(const Handle(Geom_Surface)& S, const Standard_Real TolDegen);

As per the compiler error, a reinterpret_cast is needed - but that didn't help either.

Any advice would be truly appreciated.

Thank you!

Fernando

Kirill Gavrilov
Mon, 07/24/2017 - 18:52

Make sure that you have included Geom_BSplineSurface definition (e.g. #include <Geom_BSplineSurface.hxx>).
It is possible to make a forward declaration of Geom_BSplineSurface and Handle(Geom_BSplineSurface), but to use the inheritance information the class definition should be available to compiler.

Fernando Ghedin
Mon, 07/24/2017 - 23:34

Hello Kirill, yes, the include was missing .

Thank you very much for your help.