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Using Vertex colours to edit world position offset

In UE4 I am adding a simple grass wind to some foliage I made and have painted the bottom of the mesh a different colour to mask so it doesnt move and the rest does, however when I test the material the whole mesh moves, and when I test the vertex colours in the defuse slot it shows that they imported corrected and yet they are not working with the world position offset. My question is why isnt the vertex colours working for this and have I possibly overlooked something. Below is a screenshot of the material edit, its very basic what im doing for this yet cant understand why it wont work.

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Product Version: UE 4.14
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asked Mar 31 '17 at 12:27 AM in Using UE4

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