Missing openings

[carmenfan]

Hi,

I'm trying to evaluate the library to replace IFCOpenShell and have come into a model where the wall isn't extruded for the windows:

what it looks like on BIM vision:

Model used: duplex.zip

I saw #210 and thought it might be related so I tried a range of epsilon values (1e-1 to 1e-15), and also retriangulating the mesh set as suggested here , but none of which has got me closer to what I want to see. So I started to wonder if it is not the same issue.

Any help/pointers would be much appreciated!

[ifcquery]

Hi,
I'm aware that the boolean operations with Carve have some issues.
I tried different epsilons, also normalizing the meshes before bool ops.
Doesn't work perfectly yet...
With some funding I could spend some time on improving the mesh quality by merging coplanar faces etc.

[carmenfan]

@ifcquery thanks for your quick reply!

If the problem is on Carve, does that mean that I might be able to make it work if I recompile it with OpenCascade?

[ifcquery]

OpenCascade is not fully implemented in IFC++.
Meshes need to be converted to OCC in CSG_Adapter::computeCSG in case Carve fails.
Sometimes it is not possible to detect a failure in a CSG operation, the mesh is just not correct.

[ifcquery]

If you want, you cant contribute some implementations, but simply recompile with OCC won't do it