Previously, the wrong node id (root node id) was used. Dirty leaf nodes
do not actually recalculate aabb.
Additionally, when requesting a new leaf, mark `dirty` as `false` in `clear()`.
Make sure to only mark the leaf as **dirty** when shrinking the border of
the leaf when removing items.
In other cases, the leaf node's aabb will get the correct result immediately.
1. When adding an item, the leaf nodes will be calculated immediately.
2. Removing the item within the border of the leaf node has no effect on the
original aabb.
Changes passing of current_tree from a member variable to a function argument, making bugs due to stale state less likely.
Fix a bug in deactivate where current_tree variable was stale. This may have resulted in visual anomalies.
Port lawnjelly's dynamic BVH implementation from 3.x to be used in
both 2D and 3D broadphases.
Removed alternative broadphase implementations which are not meant to be
used anymore since they are much slower.
Includes changes in Rect2, Vector2, Vector3 that help with the template
implementation of the dynamic BVH by uniformizing the interface between
2D and 3D math.
Co-authored-by: lawnjelly <lawnjelly@gmail.com>
