Hi Jean-Paul,
No, I haven't found any way to automate this process since it requires an explicit selection and modification of each element's edge (or face). I also tried various combinations of CONVERT BREP and TFREMOVE, but haven't found a specific combination that works the same on all ABD component types.
However, looking at this again, perhaps there's a simpler method - if you save your file to DWG and then that file back to DGN, you should end up with cells composed of meshes that can be manipulated in plain MicroStation. Perhaps that's a viable alternative? For that matter, I suppose other available 3D formats might work as well.
No, I haven't found any way to automate this process since it requires an explicit selection and modification of each element's edge (or face). I also tried various combinations of CONVERT BREP and TFREMOVE, but haven't found a specific combination that works the same on all ABD component types.
However, looking at this again, perhaps there's a simpler method - if you save your file to DWG and then that file back to DGN, you should end up with cells composed of meshes that can be manipulated in plain MicroStation. Perhaps that's a viable alternative? For that matter, I suppose other available 3D formats might work as well.