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Question about texture packing

polycounter lvl 15
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Popeye9 polycounter lvl 15
I have been building a scene and texturing it with Substance Painter. For the metal rough and various textures like emissive I have been texture packing them into the RGB channels and importing as a single texture to UE4. I am wondering since these are Grayscale maps to begin with if I need to be doing this or is it a waste of time. Any clarification of this would be appreciated.

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