Layout not exporting to PDF properly? (objects in front )

[davesec]

hi!

i have a section of a building i did in sketchup.. it's a little messy but when you look at it in parallel projection/elevation everything lines up and i'm happy with it.

so i imported it into layout, and it still looks fine. and then i exported to PDF and now all the trees that were behind the model are suddenly in front of it?

any suggestions?!