I’m creating custom terrain meshes using 3ds , and I’m having a hard time creating colliders for it, since it has lots of hills, and it appears that colliders have to be convex hulls to work on UE4. I also tried unchecking “One convex hull per UCX” but it just messes up the whole collider mesh.
Is there a simple way of creating correct colliders?
Take a look at this video: 
(the 3rd way)
Also, try setting the StaticMeshSettings -> Collision Complexity to “Use Complex Collision as Simple” which means use the actual geometry as a per poly collision model.
This is mentioned in the doc but it needs to be worded better IMO:
https://docs.unrealengine/latest/INT/Engine/Physics/Collision/index.html