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how to remove the error edges on the material?

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These are the final render for couple of material instances I made through a master material. I set up the pramaters for UV Tiling also. It came out like this and there are error edges showed up on the material. I thought it must be something to do with Texture coorndinate expression. So I went back to tweak the expression ~ set "Coordinate Index" to 0, UTiling and VTiling as 1. And it didn't change anything. Not sure why and couldn't find a solution online. Any suggestion or comment would be appreciated! Thank you so much!

~ Jasmine.

Product Version: UE 4.20
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asked Oct 30 '18 at 04:00 PM in Rendering

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Chunzi Wu
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