Question: How can i adjust the visibility of a mesh in a way that is importable in ue4 via FBX

Ultragrisen

Let's say i have 1 tower object. This tower is made of 3 boxes, each one on top of the other. The animation goes as followed 1)Base of the tower (Box1) is scaled from 0 to 100. 2)2nd part of the tower (Box2) moves to position from inside the Box1 3)Same for the last part (Box3). it moves to position after animation of Box2 is finished.

Now to avoid seeing the Box 2 + 3 i made a visibility track in 3dsmax which works great, but UE4 won't recognize it

Ultragrisen

Obscura

I dont think there is a way to import something like this. If you want to make it working like that, the easiest way is to import them separately, and make a blueprint out of them. You would add them as static mesh components, and you would lerp the opacity through a timeline, that is a very clear  and easy way for doing something like this.