How can I add blocking terrain?

[bharrison]

So, I have a group of agents moving. All looks very good.

Now, I want to place things in front of them and expect them to avoid the objects.

Can I simply create geometry in Maya? Because, that does not seem to work.

I did mark the geometry with the Terrain Manager but that did not help.

I am starting with one block primitive.

[bharrison]

I did try to add repelling to one primitive but the actors just slid to the side going around it ... very unnatural and it was a fast jump to the side to avoid the wall.

What's the better way to express walls and such?