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Is it possible to create an irregular-shaped collider? If so, how? Would I need to create a couple objects and group them up into one Game Object?

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up vote 4 down vote accepted

Mesh colliders and parented objects are the only real way to do things, Unity or otherwise. Note that mesh colliders can be a lot more expensive, but are the only choice if you need fairly detailed collision handling for "irregular" objects.

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Is it possible to import a shape as a collider? – Blue Jul 10 '12 at 19:49
You can import any arbitrary mesh and use a mesh collider. – Sean Middleditch Jul 10 '12 at 19:50

If you don't want to use a mesh collider (maybe for performance reasons), you can build a compound collider as described halfway down this page.

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