Made these for myself a while ago. Easy to just drop in if you’re already using the default terrain grass, and feels like jumping from 2002 to 2010 in one go.
Before and after:

The shaders: GitHub - Nition/UnityTerrainGrass: Drop-in replacement terrain grass shaders for Unity
Should work in Unity 4 and up, at least until they update the terrain system one day. Probably works in Unity 3 as well.
- Make some built-in Unity terrain with grass.
- Drop the two shaders from this repo anywhere in your Assets folder. They’ll automatically override the hidden default ones.
- Press the Refresh button on the grass placing screen.
Literally just a swap from cutout shader to alpha transparency. You’d think there’d be a performance hit but there wasn’t one for me. I suspect there could be if your grass is dense.
