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Strange behavior with Custom UV

I'm attempting to "squeeze" the UV's in a material to achieve a faked perspective. To do this I'm scaling the X coordinates and using the V coordinates to lerp between the scaled coordinates at the top and unscaled at the bottom. The result is sort of what I'm looking for, but I don't want this curved effect: alt text

I tried using custom UV's to force it to use the vertex shader, but the results are very strange: alt text

Does anyone have an idea on how to achieve this? alt text

Shader is attached: link text alt text

Thanks! ~Mike D.

Product Version: UE 4.14
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asked Jan 04 '17 at 06:10 PM in Using UE4

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frogspasm
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