UCX from Blender 3D to Unreal Engine 4
To correctly add and export custom collision from Blender 3D to Unreal Engine 4 it is important to keep in mind two main rules as naming, parenting & selecting.
To make Unreal Engine 4 be able to see our custom collision we need to name it correctly. Collision name must be same as object with “UCX_” before the name. For instance: Object “Cube” must have collision named as “UCX_Cube”.
In case you would like to have more then just one collision, you can do it simply by adding “_01” numeration: “UCX_Cube_01”, “UCX_Cube_02”, “UCX_Cube_03” …
Second important thing is to parent your custom collision to the object. In Outliner simply grab and drop “UCX_Cube” on the “Cube”.
First select the collision, then object and you ready to export as FBX. If you want to make sure your FBX settings are right see the Export settings from Blender 3D to Unreal Engine 4