The Viewer node was apparently removed in 3.4. It was said to be redundant, I don’t really get it but it’s gone. I use 3.3 LTS generally, I can confirm it still works in that version
Ah, that explains it. Also things like MixRGB and some math nodes have been “removed”. Apparently I can use an emit node by hand to achieve the same effect.
B.Y.O.B
(Node Preview and LuxCore Addon Developer)
5
It was an emission node behind the scenes (see screenshot below).
Since the material output already behaves like an emission node when non-shaders are plugged into it, the viewer emission node was unnecessary.