Traps

ok i want to create a trap sort of like a spike crusher Comes down n up.

Ive tried the Simulate jump with jump helper Sometime it work sometime it just doesnt feel like jumping

Ive tried Repeat loop nuthing works and i dont know how to use Pathfinding I'm going crazy trying to get this to work And ive look around and i dont see anything that would help me.

Here is a very simple demo using the sine behaviour [r125].

There's obviously a lot more that can be done with this from a gameplay point of view, but short of actually animating the traps frame by frame, the sine behaviour is a solid way to get this kind of repetitive motion.