GPU Particle don't collide with actor?

Hi everyone
I use GPU sprite to make the waterfall and i want waterfall collide to static mesh. Everything is fine when static mesh stay in screen (As picture one. That is waterfall in red frame).

When static mesh ain’t in screen, particle didn’t collide to static mesh.

How to solve it. Thank You

Go to the collision module, and in collision mode, set “distance field”.
It will appear a red messenge telling yo that you have to check “generate mesh distance field”… So, go to the projects settings, rendering menu and in the lighting tab you will see the “generate mesh distance field” option, turn it on, restart unreal, and you’re done