I am trying to put together a parametric roman rib vault in Grasshopper to be used in BIM (ArchiCAD). First I construct the surface and then I add the side surfaces and finally I am adding the top surface and join all the breps, which results in a closed brep according to Grasshopper. After this I …

[image] Balazs: any advice on this? 3. Attach minimal versions of all the relevant files [image] Help Us Help You Grasshopper Asking questions and getting answers is what this forum is all about. Although people are generally very helpful, there are things you ca…

[vaulted_ceiling_2019Dec16a] vaulted_ceiling_2019Dec16a.gh (19.3 KB) P.S. Purple group. [vaulted_ceiling_2019Dec16b] vaulted_ceiling_2019Dec16b.gh (18.1 KB) P.P.S. [vaulted_ceiling_2019Dec16b2]

Hi Joseph, Thanks very much for your solution. Actually the archs have different height in my case. But actually I am interseted in the theory. Why is my closed brep not solid? As I said somewhere I have read that in Grasshopper closed breps automatically considered solid, but not in my case. What …

[image] Balazs: Actually the archs have different height in my case. Ugh. That’s not how the Romans did it, did they? I can see several reasons your model fails to create a “Closed Brep”. The four bottom corners taper to nothing. The top inside touches the top outside. I might have looke…

I dont undestand why are you saying it not closed. Grasshopper says it is closed. See attacehd image. [closed]

[image] Balazs: I dont undestand why are you saying it not closed. Grasshopper says it is closed. I said it is a “Closed Brep”, as shown in the image I posted. Why aren’t you using it?

See the very first image I have made in ArchiCAD. If it was really closed the model would be solid isnt it? Maybe it is a bug in Grasshopper…

any idea that a closed brep supposed to be solid or not?

I may be wrong but there is no real solid in Rhinoceros. It is not a solid modeler. Rhino use BREP representation so Boundaries, if there is no “free” edges the surface is considered closed. I don’t know Archicad, but what uses this software uses ? Mesh or Brep ? If Mesh Joseph gave you clean mesh…

Solid mesh from brep creation problem

Grasshopper

Joseph_Oster December 16, 2019, 2:52pm 3

3. Attach minimal versions of all the relevant files

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Solid mesh from brep creation problem

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