Ring arena

[pelegs]

Hi!
I'm trying to create a ringed shape arena.
I've seen in the forum that back in 2012 there was no such entity. I was wandering if the situation has changed.
If not can I create a custom ring entity like the box/cylinder?

What I did so far is to create lots of small walls but it complicates my calculations as it interacts with each small wall as it is a different object. I'm imitating vision and not proximity, each purple line is an edge of an object the robot 'sees'. I've attached an example.

Thank you for your help!
Love working with your simulator,

Peleg