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Decal opacity question

I'm very new to using UE4, and I'm having a problem working out how to make a decal with a material that has opacity aspects to it.

I just want to make a decal of cracks in the ground. I have a crack material, and can place it as a decal, but I cannot remove... well, here is a picture.

I'm sorry I do not understand the lingo just yet, but hopefully by viewing the picture you can see what I'm trying to do. I just wish to remove the texture around the cracks, instead of having the large black square around it.

Thank you.

alt text

alt text

Product Version: UE 4.8
crack4.png (14.3 kB)
crack.jpg (97.3 kB)
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asked Aug 30 '15 at 03:18 PM in Using UE4

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