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How can I make 1 material shader reveal another?

What im trying to do is make my footstep decals reveal the grid below them as my character walks. All I have is a simple plane with a grid material thats emissive turned off. I want my foot steps to reveal the emissive grid as the character walks and then slowly disappear. Is this something that is possible?

Product Version: UE 4.18
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asked Feb 05 '18 at 04:47 PM in Rendering

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avatar image ThompsonN13 Feb 05 '18 at 05:16 PM

i think to do that you would use either decals or a particle system. there may be a way to do it in materials but im not familiar with it if there is.

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