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Adjust grass distribution via colour channel

Hey guys, I was in attempt to adjust the grass distribution regarding a colour channel. My concept was by adjust the alpha channels I can control how the grass cover the landscape. It actually worked but it exposurized my terrain textures as well. I thought alpha channel in lerp node just determine the level of blending of 2 elements. Anyone has an idea why? alt text alt text alt text

Product Version: UE 4.16
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asked Jun 27 '17 at 11:02 AM in Using UE4

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