Boundary which shows up as red if something enters it

hi guys I want to make a 2D area which shows up red if any other 2D geometry enters into it’s space

Thank you so much helps me a lot!!! <3

If you’re responding to me, I deleted the post because i realized that it only worked for intersections. If the "intruder’ is entirely within the boundary, it doesn’t activate. if that’s OK with you, then fine, but there is a better way of going about it. See below.

This works whether at least one object is intersecting or entirely within the boundary.

Red Alert!.gh (10.5 KB)

Really do appreciate it thank you so much!

Do you know why mine doesn’t work at all? :frowning:

and I know I switched around the swatch colours but still doesn’t work :frowning:

Can you upload your version, and internalize the geometry? Thanks.