Interface TraceClusterStats

Bytes the scene grew by (negative when it shrank): copied nodes and the larger top level, less the dropped trees.

Top-level records after: one per cluster, one per record kept whole.

Node slots copied, frame slots of quantized subtrees included.

Distinct subtrees copied after the scene's nodes (shared by every record of the mesh).

Node slots those trees held, frame slots included.

The scene's own trees left out because only split records traced them (their placements say clustered).

The scene's instance records before.

Records cut into clusters (the rest kept one leaf).