I have exported a .fbx mesh from Blender to UE4 and I need to subtract a part of it in UE4, but the subtraction with geometry doesn't seem to work. What do I change in the original .blend file to make it compatible with the UE4 geometry subtraction?
AFAIK static geometry can't be used to substraction of bsp: https://answers.unrealengine.com/questions/62484/view.html
Sean L ♦♦ STAFF Jul 19 '16 at 9:27 PM
Keep in mind that this will only work with BSPs, which are placed in the Geometry section of the Modes tab. If you are using a static mesh, this will not work.
and you can't export/convert static geometry to bsp: https://www.epicgames.com/unrealtournament/forums/unreal-tournament-development/ut-development-level-design/13535-converting-static-meshes-to-bsp