# Box2D/Box2D/Collision/b2DynamicTree.h File Reference

`#include <Box2D/Collision/b2Collision.h>`

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## Classes
struct | b2DynamicTreeNode
| A node in the dynamic tree. The client does not interact with this directly. More...
class | b2DynamicTree
## Defines
#define | b2_nullNode (-1)
| A dynamic AABB tree broad-phase, inspired by Nathanael Presson's btDbvt.

## Define Documentation

#define b2_nullNode (-1)

A dynamic AABB tree broad-phase, inspired by Nathanael Presson's btDbvt.