Bullet-destructor

What about bullet, which changes landscape under itself? How to do it, is there any component?

what do you want it to do to the landscape? leave decals? deform the landscape? make flowers grow? turn the landscape into candy particles?

I want it to deform landscape

are you just wanting the grass to turn into dirt and leave a little divot? if so, having your bullet spawn a decal after it hits would probably work.

in your 3d modeling program, you could model a shallow divot as the high res mesh and use a plane as the low poly mesh and bake a normal map from it. you may need to rotate the decal based on the impact normal if you have steepish hills.

If you are thinking of landscape deformation that affects gameplay and navigation and collision for all other actors, this is a somewhat advanced thing that i dont know how to do.

if it only needs to be visual then its easier and i think there are tutorials on how to accomplish it with Materials using WorldDisplacement node or something like that.