Wetting, melting and multiphase

Wetting

Wetting is on by default. A Fluid moistens nearby Sand, Snow and Elastic particles. Wet Sand and Elastic turn into Mud.

Setting	Default	What it does
Wetting	on	Fluid moistens nearby porous material.
Wetting Rate (/s)	20	How fast contact with fluid soaks a particle.
Mud Threshold	0.6	Wetness above which Sand and Elastic convert to Mud.

The settings are on the Atom Solver and on the Atom Multiphase node, and in the Wetting section of the sidebar’s Solver panel. Pick Wetness as the viewport colour mode to see it.

Atom Multiphase

The Atom Multiphase node lets different Atom materials act on each other. It adds:

Setting	Default	What it does
Sand-Water Mixture	off	Gives water its own grid so it flows through sand by drag. Wet sand gains cohesion instead of turning to mud. Costs a second grid.
Drag (/s)	40	How fast water and sand velocities equalize in packed sand. Low means water drains through.

Melting and freezing

These live on the Atom Solver.

Setting	Default	What it does
Melting Point	0.35	The temperature (on BLUX’s normalized scale) where snow melts. With Freezing, where water freezes.
Latent Heat	0	Heat snow absorbs at the melting point before it melts, and water gives back before it freezes. 0 melts at once.
Freezing	off	Water colder than the melting point freezes into snow or ice, once its latent heat is out.

Snow’s Heat Conductivity sets how fast heat reaches it.

Lava and temperature

Lava cools at its Cooling Rate and changes viscosity from hot to cold, forming a stiffer crust. Temperature is carried on the particles. Pick Temperature as the colour mode to see it, and use it in the lookdev materials, where Volcanic Molten Lava drives its glow from particle heat.

Particles into gas

An Atom simulation can drive a Blaze solver: lava can smoke, and moving sand can raise dust. A Blaze Coupling node filters by temperature, speed or Atom material, so lava smokes while the snow it melts does not. See Particles and gas together.