2022-08-10 11:38 AM
2022-08-10 01:45 PM - edited 2022-08-10 02:56 PM
If you want to stick to this modeling method you should put the upper wall onto a different layer which has a different intersection priority number and repeat the SEO with the same operator.
Example here - the upper wall layer was set to wireframe for a better view and I used two single plane roof elements for operators:
| Archicad 4.55 - 26
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2022-08-10 02:45 PM
You went by difficult way, instead to use the roof for a slope and then all the walls trim to roof.