Crowd behaviour inside Brep

Hello Grasshopper community,

I was greatly inspired by one of Kristof Crolla's tutorial about Crowd behaviour using Hoopsnake (found on: https://wewanttolearn.wordpress.com/tag/hoopsnake/). Based on part of this tutorial, I am trying to create a similar behaviour inside a box defined by a Brep (using only the attraction and minimal distance in the script). I was wondering how I could limit this behaviour inside the initial Brep, like adding a «bouncing behaviour» when the points touch the box surfaces.

Here is my script so far: Boids_question.gh

Thank you,

Alex