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Blender 2.81, 2.81a Windows 10, 2xGTX1080 GPUs, GPU rendering

I've been through the Manual and a few tutorials, but I guess I'm missing something. Why can't I get the Cryptomatte Pick working? Is there another undocumented type of Pass that needs to be activated?

The scene is just the cube. I render the scene, hook up the nodes as below. I've tried both Object and Material options. Tips?

enter image description here

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  • $\begingroup$ Yes. As stated, I tried both types of Cryptomatte - the screenshot just shows the material try. It's still hooked up correctly, and the Pick pass should show me a coloured silhouette of the cube, whichever type of crypto I used. $\endgroup$
    – OroNZ
    Commented Dec 9, 2019 at 1:46

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for me its working pretty good. using this since blender beta. few tips to find out..

1- try this sample file in my case, it looks like this. enter image description here

steps i did to check

  • create objects
  • assign materials
  • switch to cycles
  • turn on cryptomatte (as you have already done )
  • hit render
  • use cryptomatte nodes in compositor, tested via object and material both.
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  • $\begingroup$ Yup, your scene file works on my machine. I did everything in your steps (which was everything in the Manual). Now I have to figure out what massive combination of settings you have that are different from mine :/ $\endgroup$
    – OroNZ
    Commented Dec 7, 2019 at 21:03
  • $\begingroup$ try resetting blender preferences. i am 100% sure, i hadn't tweaked any other settings. $\endgroup$
    – haseeb
    Commented Dec 7, 2019 at 21:11
  • $\begingroup$ Nope. Reset doesn't work. $\endgroup$
    – OroNZ
    Commented Dec 7, 2019 at 21:18
  • $\begingroup$ Back atcha. Does this file work on your machine? <img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=laB7VaMz" /> $\endgroup$
    – OroNZ
    Commented Dec 7, 2019 at 21:47
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    $\begingroup$ i tried, nope, it doesn't. i am glad , you found solution. :) $\endgroup$
    – haseeb
    Commented Dec 8, 2019 at 21:58
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As a side note, my solution was relating to multiple screens. I had the compositor on Screen A and Image Editor/Render Results on screen B.

When trying to pick the Matte ID (on screen A)

enter image description here

Using the Image Editor/Render Results (on Screen B), cryptomatte does not pick anything up.

However, if I setup the compositor on Screen B (i.e the same screen as the Editor/Render Results), cryptomatte does work.

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After going a little crazy hunting down the problem, I reset my Prefs to Factory Settings... which didn't fix the problem.

However, resetting my Startup File seemed to do the trick (File > Defaults > Load Factory Settings). It must have become corrupted somehow during my upgrade from 2.79 to 2.80, because opening older files seemed to use Cryptomatte just fine. I still don't know what caused the problem in the startup file, but... problem gone now.

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