For this reason we have up to 4 different buildingmaterials for basically the same material with increments of 1 in priority (for example 600, 601, 602, 603) for laminated wood panels, wood, MDF, etc. It takes a bit of planning when assembling furniture, or fine trim detailing, but it results in clear and readable sections.
Similar problems occur with concrete (prefabricated element assemblies).
It helps to have multiple fills too, once you start using the same ones for windows/doors/skylights/objects. These do not use buildingmaterials, but tend to merge similar fills touch in section.
Let's say you have a wooden window frame set in a wooden panelling facade, if they both use the same cut fill, they will merge. Or empty fills for the air cavity and empty fills for frames. It's a 'problem' we get a lot at early stages of design before going through some of the sections to fix it.
Regarding intersection groups: these work like a charm, until you start saving stuff in to hotlinked modules and everything in the module behaves according to the intersection group number of the hotlinked module 'master' layer, rather than the layers of the hotlinked elements. Not cool
Erwin Edel, Project Lead, Leloup Architecten
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