Hi, This is a file I put together to show how I did the erosion effect two years ago. I was asked if I could share the hip so here it is. It's been a while since I did that and I lost the original file so I rebuilt it. It's not that hard to do, basically it's all driven by a sopsolver and some particles. The particles collide with the surface and "erode" and "deposit" a bit of material. I visualized it using red and blue. Blue was eroding, red was depositing. So initially the particle is