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Culling Bug?

After following the tutorial for grass foliage https://docs.unrealengine.com/latest...art/index.html i run into a Problem with the start/end culling variables. Ive already posted it at the unreal engine Forums but no one could yet help me.

The Problem is, that the culling is extremly short and whatever or however i Change the variables it doesnt effect the culling radius.

Ive set up the PerInstanceFadeAmount in the material Editor and multiplied it with the alpha channel with one of my base textures and connected it to the opacity mask.


ive posted some screenshots at the ue4 Forums, if someone wants to see the issue.

Ive already checked the engine scalability and its all set to epic.

I appreciate any help! thanks!

Product Version: UE 4.8
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asked Aug 30 '15 at 08:12 PM in Rendering

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avatar image Prometheus88 Aug 30 '15 at 09:53 PM


avatar image AndrewHurley Aug 31 '15 at 06:22 PM

Hello Prometheus88,

You mention in your most recent post, this issue is not occurring when you "disconnect disconnect the texture in the material editor," on your grass mesh the issue goes away.

Would you mind elaborating with a screenshot/image of your grass meshes material? If you can reproduce this issue in a new blank project and have some simple steps I can follow in order to see it on my end, that would also help speed along the troubleshooting process.

Let me know if you have other questions.

Thank you,

Andrew Hurley

avatar image Prometheus88 Sep 01 '15 at 10:48 AM

Hello, thanks for the fast response!

i made an video where i did everything the same i did as before (and also as mentioned in the official documentation).


Textures used: the grass and rock textures found in the starter content.

Ive did this now with the 4.9 release and its (as you can see) still there.

If there is anything not clear or if you prefer Images just let me know, i will upload them.

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Hey Prometheus88,

From the video you have provided and from my own test results, it seems you could be misunderstanding how Culling works. The distance that you are setting is from the Camera itself, which is why you are seeing various results because you are consistently flying in and out with the camera.

If you keep your camera stationary and edit the 'End Cull Distance' you will notice the changes do have an effect and cull based on distance from the camera.

Landscape Grass Type - Cull Distance Close

alt text

Landscape Grass Type - Cull Distance Long

alt text

As you can see, I have set the 'End Cull Distance' to a different value and kept my camera in place. If you have any other questions please let me know.


Andrew Hurley

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answered Sep 01 '15 at 01:43 PM

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