Best way to approximate a circular arena

[dangerdaveCS]

I want to have my critters running around a circular arena - a 'dish'. My first thought was to create a bunch of planes along the walls, i.e. each plane being a 'segment' of the circle. But that might be a bit slow if there are gazillions of them, plus its not a true circle then..

Maybe a similar approach, but using cuboids, so that the broadphase can work its magic? Still not a true circular arena, though.

Or maybe there is a way to 'invert' a cylinder collision shape?

Any ideas?

Cheers,

[sparkprime]

Just do a relatively high poly trimesh

[dangerdaveCS]

Hmm, I was under the impression that would be a very slow method, is that not the case?

[sparkprime]

not so much, there is a good hierarchical culling algorithm for triangles that are not near collisions

[sparkprime]

Just make a high poly plane to test it if you want