These options define the default referencing behavior of imported references. These behaviors can be modified on a per-scene basis in the Reference Override Settings dialog box. For additional information, see Import Reference. The operations include:
Allow Channel Overrides
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Changes made to any of the associated attributes of the item itself, such as changes to the transform values or item specific changes such as changing a mesh item's subdivision level.
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Allow Name Overrides
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Changes to the referenced items' names (overrides are tracked by an internal ID assigned when the items are imported).
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Allow Structural Overrides
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Changes to the hierarchies of the referenced elements, meaning their ordering in parent child relationships can be changed, or their positions within the Items lists.
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Allow Deletions
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Control whether or not referenced items can be removed from the master scene.
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Allow 3D Selections
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Controls the selectability of the referenced elements in the 3D viewports.
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Each of these operations have four possible states governing it:
• Always Allowed - Override changes can always be made of the designated type.
• Never Allowed - Overrides cannot be assigned, editing of the referenced items is locked.
• If Allowed by Item - Overrides cannot be applied, unless explicitly set as Enabled by the reference item setting.
• Unless Disallowed by Item - Overrides can always be applied, unless explicitly set as Disabled by the reference item setting.
The latter two settings can be defined directly on the items, either within their source scenes, or as referenced items within the master scene. To do this, select the target element to control, and then in the menu bar, select Items > References > Item Override Settings, which opens a dialog box.