Unity2d Tall grass effect

Hello,

I'm using Unity to create a 2D top-down game. Everything has been great so far, but I have come into a problem that I fail to solve properly.

I want to implement "tall grass areas" where part of the character will be occluded.

A visual example:



I though about making the tall grass by layers, but that would create a LOT of game objects, and the transition as the character moves up won't be smooth enough.

I thought that maybe using shaders I...

Unity2d Tall grass effect