pbd liquid phase

 

 

Each liquid simulation can have multiple liquids that are considered as separate phases – they don’t mix.

Phases can have different physical properties such as damping, friction, adhesion etc.

 

 

[Inputs]

 

 

Enabled - Enable or disable node evaluation.

 

PhysX Sim - Select the PhysX simulation that will include this liquid.

 

Particle Group - Use this listbox to assign particle group to particles in this liquid phase.

 

Phase ID – Each phase has its own unique ID. Phases with the same ID will mix while phases with different ID will remain separated.

 

Note: PBD Liquid particles and NodeWorks particles cannot be mixed and they have strictly separated flows. PBD Liquid particle group allow artist to use particle group display, cache and render properties.

 

Scale – Simulation parameters depend on the size of the simulation area. Default values will create realistic liquid for an area around 50x50x50 inches (3ds max generic units), or 1.25x1.25 meters. If you’re working in a much larger scale, you might need to adjust this scale parameter.

 

Damping – Velocity damping for liquid particles. Using too small damping might introduce instabilities and particles can start to behave erratic.

 

PBD Liquid Phase – Damping variations

 

Friction – Friction between liquid particles.

 

Adhesion – This value represents “stickiness” between particles.

 

Viscosity – PBD liquid does not support viscous liquids like honey so it’s impossible to get effect like you can get with viscous solver type. However, this option can mimic a low viscosity liquids.

 

PBD Liquid Phase – Viscosity variations

 

 

Surface Tension – Liquid surface tension is the force that causes the molecules on the surface of a liquid to be pulled together, creating a "skin" that makes the surface less penetrable.

 

PBD Liquid Phase – Surface Tension variations

 

Cohesion – Use this value to change the force between liquid particles throughout the liquid volume.

 

PBD Liquid Phase – Cohesion variations

 

Vorticity – It measures the tendency of fluid particles to spin around a local axis, creating swirls and eddies. Vorticity is a key factor in achieving realistic fluid dynamics in simulations, as it helps capture the detailed turbulent flow patterns seen in real liquids. Vorticity is more noticeable when using a very low Damping value.

 

PBD Liquid Phase – Vorticity variations

 

Lift – Particle lift force.

 

Drag – Particle drag force.

 

Object Friction – Friction between liquid particle and rigid bodies.

 

PBD Liquid Phase – Object Friction variations

 

Object Adhesion – Adhesion force between liquid particles and rigid bodies.

 

Note: Sometimes Object Friction and Object Adhesion values must be very high to see their effect, so feel free to experiment with values like 100, 1000 or more.