Is there a way to disable the metallic channel of a deferred decal material while still allowing it to inherit the roughness of the material it is projected onto? Setting Metalness to 0 seems to cause the decal’s roughness to become uniform. Maybe this has something to do with using packed textures for the Metal and Rough maps? Idk
I guess there isn’t a way… 
Nope, at least not by default, here’s a huge thread about metallic in dbuffer decals Metalness in DBuffer decals - #19 by and-rad
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