Can't see mist pass

I’m trying to emulate what Gleb Alexandrov was doing in this tutorial at 2:39 (already queued up)

When I plug my mist pass into the viewer or composite node, nothing happens…
In the tutorial I cannot see exactly where the pipe is going, though I assume it was to the viewer. I also don’t know if he hit a shortcut key to view Alpha or mist pass…

Any advice on how to view just the Mist pass? I’m a Cycles and Blender node editor noob too, so thanks for your patience!

When the mist pass is enabled, you need to set the start point, end point, and falloff of the mist in the world context (or otherwise you get a result that might be all white or all black).

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OK thanks! I guess it started working… for some reason when I checked Backdrop nothing was showing up and I had to exit and restart Blender.

Be sure to rerender once you have enabled the mist pass in the render settings… otherwise it wont display anything (as it did not store this information from the previous render)