version – Boolean
Some kind of illusion can be done with boolean operation. You can start with Geometry Nodes to create grass object ...
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/48D8H.png)
... but final "cut" is boolean operation (grass differenced with Circle object displaced by Radial Texture), that results in glitchy anim (doesn't matter if I use boolean operation inside GN or as modifier).
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/M0pZ2.gif)
What solved this is Solidify modifier for grass object, but in cost of viewport playback (1 fps).
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/yPLE3.gif)
Falling parts are particles emitted from Blade object ...
![](https://cdn.statically.io/img/blend-exchange.com/embedImage.png?bid=5sgyDObV)
version – Particles
Another illusion can be done with two exactly the same overlapping particle systems.
One with tall grass and hidden blade on plane surface level to kill particles ...
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/BXRRc.gif)
... in combination with second one identical Plane. The only difference is Render as Object with shorted grass model.
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/vqYti.gif)
This gives you an illusion
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/BSc0h.gif)
Falling cute grass can be faked in the same way like in the first version.
![](https://cdn.statically.io/img/blend-exchange.com/embedImage.png?bid=6P9wDgNm)
Notes:
- Particles works here only because I disabled Gravity
- I wanted to use Hair system, but it didnt react on collision object Kill Particles.
- Another thing that doesn't work is to use blend texture controlled by another object (that is known issue)