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Grass tool culling broken


Grass Tool isn't culling the meshes properly. Meshes happen to appear/disappear in quads instead of appearing/disappearing individually. This bug might be specific to some specific landscape sizes only i.e in my case 1009x1009.

Repro steps: 1. Create a landscape with the given settings as in the image. 2. Setup a material with grass node. 3. Use a mesh in grass node with high density. 4. Reduce cull distance to 5000. 5. Fly forward/backward to see the meshes culling.

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Product Version: UE 4.15
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asked May 24 '17 at 01:13 PM in Rendering

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avatar image Fisher007 Feb 17 '18 at 10:36 PM

It's a bit sad to see that this was existing in 4.15 and I'm experiencing the same issue with 4.19.

avatar image Deathrey Feb 18 '18 at 11:44 AM

That is not an issue. The grass is expected to cull in clusters like this. To get a gradual circular fade, you would need to use PerInstanceFade material expression in your grass material.

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