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Documentation : Effex : Objects : Particles : Particle Group

### Diffuse Particles

Passive Particles Liquid Particles Vorticity Particles Diffuse Particles
Diffuse Particles

Diffuse particles have the purpose of providing the user with a custom particle system that is specifically designed to handle large-scale diffuse materials such as foam, spray and bubbles. The foam, spray & bubbles node for example will always write the particles it generates into this particle subgroup.

Diffuse Particles::Display

#### Draw each Xth particle

Allows to set an interval for drawing particles. A value of 0 will turn off the display of particles.
A value of 1 will display all particles, a value of 2 will draw each second particle and so on.

#### Color

The display color of this particle type.

#### Size

This option, if set > 0.0, will create for each particle a sphere render instance of the specified size.

#### Instants

Instants are evaluated when a certain event takes place. In this case the particle-volume collision event will trigger instant operators.
Drop any instant operators in here to let them do their thing on particles when they do collide.

#### Kill outside containers

If particles leave a used fluid dynamics container, this setting (activated) will let the particles die instantly.

#### Integrator

Defines how the advection (moving the particles around inside the grid based on the velocity field) in time and space is integrated.
The higher the order number, the more accurate the integration will be.
In order of quality:
Euler 1st Order
Runga-Kutta 2nd Order
Runga-Kutta 3rd Order
Runge-Kutta 4th Order (best)

#### Ballistic Integration

Defines how the ballistic advection (moving the particles around according to any external particle forces) in time and space is integrated.
Euler
Advects particles using a special Euler intergrator. This integration is based on the position and velocity of the particles.
Any available external force property is also taken into account.
Verlet
Advects particles using a Verlet integrator. This integration is based on the position of the particles only. This is the same integrator that was used for the former Simple Particles.

#### Advection Substeps

How many substeps should be taken per advection step. Can improve accuracy.

#### Exclude & Fluid Dynamics

The drop down lets you decide if the below Fluid Dynamics list and any of its entries are excluded or included from being used in the particle advection step.

#### Particle Forces

Drop in here any Particle Forces or Dual Forces that shall act on the particles in this subgroup.