Abstract: Apparatus and method for tree structure data reduction. For example, one embodiment of an apparatus comprises: a plurality of compute units; bounding volume hierarchy (BVH) processing logic to update a BVH responsive to changes associated with leaf nodes of the BVH, the BVH processing logic comprising: treelet generation logic to arrange nodes of the BVH into a plurality of treelets, the treelets including a plurality of bottom treelets and a tip treelet, each treelet having a number of nodes selected based on workgroup processing resources of the compute units; a dispatcher to dispatch workgroups to compute units to process the treelets, wherein a separate workgroup comprising a separate plurality of threads is dispatched to process each treelet.