How to check if EEVEE or cycles is used?

Question

Is there a way for a shader/material to check if it is being render in EEVEE or cycles? I want to activate different nodes that immitate or indicate some effects that don't work so well in EEVEE, for previewing.

Answer 1

You can enable Material Output for a specific render engine. This will allow you to create a single material with one material output for Eevee and one for Cycles.