This mod adds new desirepaths to the world of TerraFirmaCraft, which can be created by both players and animals, with the latter being configurable. Which blocks changes into what can be customized via datapacks, as they use a simple recipe system, which means you can also add your own recipes. By default grasses change into their corresponding dirt types. Dirt will have a chance to compact/change to mud when it's raining and a player or animal is walking on it. If a player is sneaking paths won't be created, and sprinting will increase the frequency of path creations.

Furthermore, new grass mechanics have been added to forests and other dark or light areas; if it's too dark, grass will gradually decay away, leaving the surface bare (dirt), while regrowing to its full strength if there's enough light. This dynamic creates more transitional forest undergrowth, and may even help expose clay or peat deposits. (configurable, true by default)

Datapack json recipe example (1.20.1):

{ "type": "tfcdesirepaths:compact", "ingredient": "tfc:dirt/loam", "result": "tfc:mud/loam", "mud": true, "chance": 80 }

Where mud is a special check for only if raining, and chance is the odds (1/n) for the recipe to succeed.

The 1.18.2 version of this mod requires TFC Florae