Box2D Get Bounding Box of a Body

转载自：http://gamedev.stackexchange.com/questions/1366/box2d-get-bounding-box-of-a-body

问题：

In Box2D, I was curious if it's possible to get a bounding box of a body already created in the world.

So basically, the Body is created, it's interacting with the world and such. And I needed that Body's bounding box. Is it possible?

答案：

In Box2D, bodies don't have bounding boxes associated with them, fixture do.

So you need to iterate over all the fixtures and generate a new AABB. Something like this:

b2AABB aabb; aabb.lowerBound = b2Vec2(FLT_MAX,FLT_MAX); aabb.upperBound = b2Vec2(-FLT_MAX,-FLT_MAX); b2Fixture* fixture = body->GetFixtureList(); while (fixture != NULL) { aabb.Combine(aabb, fixture->GetAABB()); fixture = fixture->GetNext(); }