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Emissive brightness with greyscale

Hey, I just spend some time to figure out if it's possible to get different brightness with an emissive material for different parts of an object. The green should be way brighter than the whiteish part. Here are some of my tries. Generic emissive material:

alt text

Some experimenting:

alt text

adding invert since the green is way darker, but just got white out of it:

alt text

This is the mask i was using:

alt text

Product Version: UE 4.22
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asked Aug 13 '19 at 06:48 PM in Using UE4

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