Effects (each comes in 3 colors of dirt - light/medium/dark and a few clay coloured) :
Top soil dust (short and/or long term)
Top soil kick up (also producing rocks and dirt bits)
Dirt bursts (also producing dirt bits and a few rocks)
Dirt chunks (also producing dirt chunks and bits)
Mud chunks (also producing dirt chunks, mud chunks and blobs)
Mud splashes (also producing mud chunks and blobs and the odd rock)
Sliding kick up (also producing dirt bits and chunks and lots of rocks)
Spent quite a bit of time fixing up and improving how all the mud effects work from my old More Dynamic Mud mod for ST.
Basically the effect is split into 3 categories and two types. The categories are obviously Dust, Dirt and Mud with Short and Long term types of effects.
For example soil kick up (which only occurs in the first inch of dirt/mud) produces a loose constant stream of dirt falling off the wheel (short type) and lots of dirt bits and rocks (long type) which collide with the wheels and the terrain and slide/fall on inclines.
Mud splashes (which only occur deep in the mud, or in water/mud mixes) produces watery muddy splashes and streams from the wheel (short type) and a variety of mud blobs and chunks and rocks (long type).
The vehicle in this video is quite powerful and the spin on the wheels is quite severe which is why so much is getting dug up. Playing with normal vehicles is slightly less intense