Sharp edges with scatter

Scatter Help Required
2

There are two ways, which involve Corona Distance map:

  1. Make grass clumps closer to the edges much smaller

  2. Make grass blades transparent when they are inside some kind of cutter geometry

See:
Similar forum posts:
https://forum.corona-renderer.com/ Grass Kit III for C4D and Corona render #msg130000
https://forum.corona-renderer.com/ Scatter populating oustide plane #msg88954
Corona Distance:
https://coronarenderer.freshdesk.com/support/solutions/articles/12000017221