Geometry Tree¶

The Geometry Tree provides a hierarchical view of all geometry objects in your design.

Overview¶

The tree is built from the placements[].parent fields in the JSON. The World volume is at the root; every volume is shown under its parent volume. Display group folders (_displayGroup) group related volumes under a named virtual folder inside their parent.

Tree structure rules¶

• Each volume appears once per placement, under its placement.parent.
• A _displayGroup folder is created as a virtual child of the parent volume. It groups all placements of volumes with the same display group under that parent.
• Display group folders are shown only at the highest matching parent level — they are not duplicated down the hierarchy.
• Assembly instances and boolean volumes appear as expandable nodes whose children are their components.

XENONnT example (simplified)¶

World
└── WaterTank
    └── Water
        ├── 📁 Cryostats
        │   └── OuterCryostat → OuterCryostatVacuum → InnerCryostat
        │       ├── LXeVolume
        │       │   ├── 📁 TPC
        │       │   │   └── BellPlate, TPCWall, FieldShaper_0..33 ...
        │       │   └── GXeVolume
        │       │       └── 📁 PMTs
        │       │           └── TopPMT_0..252
        │       └── 📁 PMTs
        │           └── BotPMT_0..240
        ├── 📁 Support Structure
        │   └── FloorLeg_1..4, HorizontalBeam_1..8 ...
        ├── 📁 Neutron Veto
        │   └── nVSidePMT_0..119
        └── 📁 Muon Veto
            └── mVetoTopPMT_0..83

Selection¶

• Click a tree node to select it. The 3D Viewer highlights the object and the Properties Tab shows its properties.
• Assemblies and boolean volumes show their component tree when expanded.

Context menu¶

Right-click any tree node to access: