The Outliner Roll-up tool automatically detects and corrects empty or multi-parental groups in the outliner/hierarchy.
In complex CAD design files, outliners contain extensive nodes, connections, and parent-child relationships. When importing CAD design files into real-time applications, outliners can be accidentally expanded and disorganized. In addition, not cleaning up your scene or deleting your history in your original 3D software can create excess and empty nodes in your outliner.
Processing extensive outliners are expensive for the processor and re-organizing them manually is time-consuming and expensive. The hierarchy roll up tool finds extra parents and extra nodes and deletes them.
