@Chris_Caliendo It's 90% shaders, a lot came from The Godot Shaders Bible from Fabrizio Espindola, I recommend that book if you are interested in the topics
@fridaypit It's just shaders! To keep it simple each blade is made of multiple lines described by vectors. When the player is near/on a patch of grass each part of a blade get pushed by an horizontal force (the tip more than the root) so you get the "stepped on" effect ( o)>