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Question by Dan_McElroy · Jun 11, 2014 at 10:41 AM · 2dphysicscollider

Creating an Inverted Circle Collider 2D

Hi there,

I'm trying to make a 2D game that takes place inside a circular "arena". However, I'm having difficulty in finding a workable solution to create the rigid body required, as a Circle Collider 2D is "filled", such that any object created inside its bounds will immediately be forced out.

In previous projects that involved arenas, I have resorted to creating borders from 4+ invisible box colliders. However, this approach is incredibly hacky and difficult to secure, leading to a lot of "cracks" where players or other objects can escape the boundaries.

Looking elsewhere online, using a hand-drawn edge or mesh collider has been suggested. However, given the physics-based nature of the game, combined with my inability to hand draw a full circle from a number of edges, this would no doubt lead to inaccurate collisions with the walls of the "arena".

If anyone has any further suggestions in approaching this problem, it would be much appreciated. I'm sure this is a solved problem, but I'm yet to find the solution.

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