I know this thread is a little old, and I don't know if it's been solved, but I've been playingaround with a water block, trying to turn it into mud. I've increased the density and viscosity, but I can't get the opacity and color right. This is the best I've managed: At the moment, water is the only liquid available for a water block, but I think we need mud! Does anyone have settings to effectively transform a water block into mud? Or a groundmodel to override the default mud model?