I can't find these two nodes (IOR and Density):
1 Answer
They are default Value nodes (Add> Input> Value), just renamed by user to make node-tree more "understandable".
Original node:
To rename any node open N-Panel in Node Editor window (press N) and type anything in Label field.
Renamed:
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$\begingroup$ maybe you should explain how to rename (N panel > Node > Label) $\endgroup$ May 3, 2019 at 11:05