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Material heightmap on terrain not functioning properly

When trying to create a basic terrain for a map, I've run into a problem. Somehow the heightmap of the terrain doesn't scale properly. When I adjust the material to multiply the heightmap values by a large amount, I can see some weird peaks in the terrain height that don't make much sense.

If I don't do this, the terrain appears flat. The contour when selecting it, however, implies that the terrain does use the height map! alt text

When playing, the terrain also flickers from time to time.

I have scaled the UV tiling for the material since it would otherwise display the material hundreds of times in each direction, but I doubt that is the problem. When using the LandscapeLayerCoords node instead of the regular TexCoords node, the same problem persists. alt text

I have no idea what causes this problem or how to fix it, I would really appreciate some help!

Product Version: UE 4.8
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asked Aug 08 '15 at 02:09 PM in Using UE4

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