Trim function issue

[SectionSeven]

Wondering if anyone can advise. When using the trim tool between the roof plane and wall, I end up with the wall showing on the surface plane of the outer roof. Attached image shows the issue. Why would this occur?

 

[Lee Hankins · Accepted solution]

This happens because the building material of the wall is a higher priority than that of the roof. You need to either change the material of the roof to one that has a higher priority than the wall or open the Building Material settings from the Attribute Manager and increase the priority so that it is higher than the material used for the wall. 

[SectionSeven]

Thanks for that. Appreciated.