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Culling problem in terrain with DX11 tessellation

Hi guys! I have a problem using DX11 tessellation.

My situation: I have a terrain and I want to apply a desert sand material (obtained through content examples) and use the tessellation to get an amazing effect.

The problem is with culling in the screen borders. It is seen better in a screenshot: https://drive.google.com/file/d/0B3Apfe1LHlZHaUNOZUdGemhUMkE/view?usp=sharing

The effect in game is horrible!!!

Here is the layered material: https://drive.google.com/file/d/0B3Apfe1LHlZHbDEyTFI4UENIRmc/view?usp=sharing

Thanks a lot!

Product Version: UE 4.12
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asked Aug 03 '16 at 11:06 AM in Rendering

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jnc00017
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avatar image Suraci Jan 24 '17 at 09:26 AM

Rising Max Displacement under tessellation did the trick for me.

https://gyazo.com/eae8b4bd0c12ef8d990596fb4d7dfeb9

(Working in 4.14, I dont know if it works for 4.12 and lower tho).

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3 answers: sort voted first

Anybody has the same problem?

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answered Aug 05 '16 at 01:20 PM

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jnc00017
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I have the same issue.

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answered Aug 07 '16 at 12:34 AM

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Soul-_-Exist
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Tessellation is a GPU effect, so it is not considered when performing culling, so extreme levels of tessellation that rise or lower the terrain a lot will cause culling to be incorrect, as it will continue to use the heightmap of the terrain to determine the bounds for culling, your better off deforming the terrain and only using tessellation to rise/lower the terrain a little.

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answered Aug 07 '16 at 05:07 AM

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GalaxyMan2015
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avatar image jnc00017 Aug 07 '16 at 12:21 PM

But I raise the terrain just a little bit and the problem occurs. Is there a way to adjust culling distance in options?

Thanks a lot.

avatar image GalaxyMan2015 Aug 07 '16 at 01:03 PM

Try playing with the Positive/Negative ZBounds extension parameters on the Landscape Actor (I dont know if this is only 4.13 or not, as thats the only engine I have in front of me right now).

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