Grass tool culling broken

Hello,

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.

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

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.

That’s wrong, the circular culling is ok in editor, without any “PerInstanceFade” node, but not in standalone, spawing everywhere on close landscape components instead of distance to camera, so there’s obviously something wrong between editor and standalone.

I have the very same issue!
Any idea on how to fix this? It is not very plesant to watch such a choppy transition :confused:

I don’t know if you still need help but you have to enable lod dithering in grass materials and all lods materials