Surface environment-obstacles problem

Hi ;
I want to put an obstacle in the surface environment in Physarealm plugin but it doesn’t see the obstacles I put. What should I do to see it? What type of obstacles should it be?

Also, after creating the route I want, the herd starts to disintegrate. What should I do to avoid separation?


Can you help me?
21.02.2020.3dm (47.5 KB) 21.02.2020.gh (24.1 KB)

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