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problem in get surface height

good evening. I followed this tutorial to get water surface world z position but i got problem.

BP class : alt text

editor setup:(camera is sceneCapture2D and plane is HeightMapReader BP actor) ![alt text][4]

result : alt text

after i started the game, sphere floated on water surface but not sync and result was very awful. how can i get water height exact position base object location?

[4]: /storage/temp/125365-02.jpg

Product Version: UE 4.14
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asked Feb 08 '17 at 10:46 AM in Using UE4

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