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Terrain in UE4 via exported height map appears pixelated


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Hi all, I'm an indie UE4 developer and I have a strange problem when using Houdini.

I create the terrain in Houdini first (following the Houdini foundation PDF) and then exported height map and layer masks to 4K maps.

Then I use these 4k maps to create UE4 terrain and layer info.

The UE4 terrain resolution is 4500*4500

I can see that the terrain has pixelated surface, but in Houdini it is smooth.

What causes this problem?

Thanks.

Houdini1.JPG

Houdini2.JPG

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