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Extrapolate clamped texture with fixed color

I want to set a small texture onto a large object, that only consists of one face. So I unwraped this face (in Blender) and scaled it up in the UV editor. The more I scale it up, the smaller the texture is on the object. (I hope it’s understandable: The unwrapped faces goes beyond the normal borders of the uv map.)

The problem is, that the pixels outside the texture are just continued from its border pixels, but I want them to be transparent (or any other color that I set).

Material editor Final result

As you can see, the corners of the stop sign are already transparent, so most of the object is blue as desired, but it also touches the border and – depending on the LOD – either the very thin black or the bigger white border of the sign are extrapolated to the sides beyond the texture.

Please note that I disabled tiling in my texture asset by setting “X/Y-axis tiling method” to Clamp. You can find this option in the section “Texture” under Advanced.

Product Version: UE 4.18
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asked Nov 30 '17 at 05:51 PM in Using UE4

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phisigma
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