How would I make it so a tweened part has to stay in a certain area/part?

[PuffoThePufferfish (Puffo)]

@davidsusbus

but how would I do the Raycast so if it hits a part it goes into the opposite direction?

using the RaycastResult (more specifically the .Normal) from Workspace:Raycast(), you would reflect the direction.
this might be a good resource idk, here’s a snippet displaying the formula you might use

@sleitnick

r = d - 2(d ⋅ n)n

Where r is the resultant reflection normal, d is the normal of our ray, and n is the surface normal that our ray hit (We will get n from the RaycastResult that the Raycast method returns).

@davidsusbus

how would I cancel the current tween to do the opposite direction tween?

TweenService has the neat behavior of canceling the previous tween in place if its on the same object with the same property, so you don’t have to; just make a new tween. Use Tween:Cancel() if you do need to stop it yourself.