Emitting DX11 particles within a bounding box



I was just wondering if there was a way to keep particles emitted within a box? What I want to do is make particles run up a model tree and so keeping it within a box I think would help me achieve this.

Thanks for any help!


If u are using DX11.Particles pack there is Bounce (DX11.Particles.Modifiers Transform)


This is great, thanks @Noir! :D