How to convert an open brep to closed brep

old forum
1

I want to use a brep join component to join 2 breps into one closed brep as wall surface for thermal analysis. However, the output of the component is an open brep.

So, how to convert open brep to closed brep?

There are two breps in the GH file attached: one is a wall surface with an opening for window, and the other one is the window surface. This is for daylight simulation in which you can’t have overlapping wall (without window opening) and window surface.

But for thermal analysis, the wall must be a complete surface without opening for window, and the window is a child of this complete wall surface. That’s why I want to merge the wall with opening and window into one surface to define a complete wall surface for thermal simulation …

… I have the feeling that I talked too much … anyway, you get what I mean …

Thanks!

open brep.gh (4.7 KB)

2

Ok, let me answer myself:

maybe the approach should be the other way around:

  1. create the wall surface without opening and the coplanar window surface that are ready for thermal analysis in the first place

  2. use region difference and boundary surfaces components to generate the wall surface with opening for window, if this is needed in situation such as daylight simulation in which wall surface and window surface can’t overlap.

Am I correct?

open brep _v02.gh (4.46 KB)

3

A surface is always an open Brep, or I should say Grasshopper consider surfaces as breps with one face.

I can think of couple of different solutions to have a surface in your energy model and not daylighting model. 1. You can just remove that surface from your lighting model, or 2. even simpler assign 100% transmittance to the glazing surface for the daylighting model.