To delete the root of a hierarchy, you must either cut its children first or branch-select it and press Delete. If you node-select the root and delete it, it gets replaced by a stand-in null.
Selecting Objects in a Hierarchy
When objects are in a hierarchical relationship, you can use the different mouse buttons to select a single object in a hierarchy, a branch of the hierarchy, or an entire tree. In addition, the Select menu in the Select panel contains commands that let you select different members of a hierarchy in different ways.
Selecting objects in a hierarchy is different from selecting multiple individual objects because it respects the hierarchical relationships you created between objects in your scene.
The type of selection matters for propagation and transformation. For example, when you branch-select the parent and translate it, all elements in the tree move; however, if you node-select that parent and translate it, the children do not move unless their local position parameters are animated. This is because local transformations are stored relative to the parent’s center. You can make unanimated children follow the parent with the Constrain > Child Transform Compensation option. For more information on this, see Transformations and Hierarchies [Transformations].
For more information in general about hierarchies and selecting, see Selection and Hierarchies.
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To delete the root of a hierarchy, you must either cut its children first or branch-select it and press Delete. If you node-select the root and delete it, it gets replaced by a stand-in null. |
To select objects in a hierarchy
1. Make sure you are in selection mode by clicking the Select icon or pressing the space bar.
2. Click on any object in the scene hierarchy as follows:
- Node selection: Left-click to select an object at the node level. Only that object is selected, not the rest of the branch.
or
Select the parent object, then choose Select > Select Child Node from the Select panel.
- Branch selection: Middle-click on any object to select the whole branch—the object as well as its descendants. (If you middle-click on a node with no children, only the node is selected.)
or
Select the parent object, then choose Select > Select Branch from the Select panel.
When a branch is selected, the branch root is highlighted in white and the children are highlighted in gray.
- Tree selection: In a 3D view, right-click on any object in the hierarchy to select the entire tree that it belongs to.
or
In a schematic view or the explorer, right-click on any object in the hierarchy and choose Select Tree.
or
In any view, select any object in the tree and choose Select > Select Tree from the Select panel or press Ctrl+t.
When you select tree-select a node inside a model, the model root is not selected. However, you can branch-select the entire model by pressing Ctrl+Shift+t or choosing Select > Select Model.
Note that right-clicking on a kinematic chain element always branch-selects the corresponding chain root even if the chain is part of a larger tree. If you want to select the whole tree, you can then press Ctrl+t or choose Select > Select Tree.
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