The Instancer mode of the node is intended for varying material behavior between instances. Since Geometry Nodes support arbitrary named instance attributes, this mode should include them in lookup. To implement this it is sufficient to store references to Geometry Node data in DupliObject, and check it during dupli attribute lookup. In order to reduce the memory usage of DupliObject, only 4 array entries are allocated, even though the current dupli recursion stack limit is 8. This assumes that not every entry would be associated with a GeometrySet instance. Hopefully, soon the whole system will be rewritten to remove the hard limits altogether. Differential Revision: https://developer.blender.org/D16114
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