Can anyone help me? My Color ID cryptomatte dosen’t work. I follow de Unreal 5 and 4.26 documentation and i get just white color on objects ID’s instead multiple colors
Documentation link >> Documentation 5.0
See if this helps:
Make sure you’re rendering as EXR
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I was facing same issue,
Cinematic Render Passes in Unreal Engine | Unreal Engine 5.1 Documentation
these is the updated and dedicated document for rendering Color ID / Object ID or Cryptomatte ID using Unreal Engine 5.1
Let me know if these works for you 
Happy to help if these didnt work
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Hi, sorry to jump here but I am having a related issue and went through the Documentation. Followed all the steps in there, but still having a weird issue.
Basically some objects are popping out of their cryptomatte color. Please see the mountains here:
Any help would be really appreciated. Thanks