Flock operator

The Flock operator allows you to add boid-style flocking forces to particles.

Flock Forces

  • Neighbor alignment: when enabled, neighbor alignment forces will be computed.

  • Neighbor cohesion: when enabled, neighbor cohesion forces will be computed.

  • Neighbor repulsion: when enabled, neighbor repulsion forces will be computed.

Neighbor Alignment

  • Direction %: the percentage of cumulative neighbor direction each particle will adopt.

  • Velocity %: the percentage of cumulative neighbor velocity each particle will adopt.

  • Variation %: the per-particle percentage of variation to apply.
Neighbor influence

The neighbor influence extends outwards from the particle’s neighbors

  • Distance: particles within this distance will be fully affected.

  • Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

  • Relative to mass: the force applied to a particle will be relative to its mass.

Neighbor Cohesion

  • Velocity: the velocity a particle will travel towards its neighbors.

  • Variation %: the per-particle percentage of variation to apply.
Neighbor influence

The neighbor influence extends outwards from the particle’s neighbors

  • Distance: particles within this distance will be fully affected.

  • Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

Neighbor Repulsion

  • Velocity: the velocity a particle will travel away from its neighbors.

  • Variation %: the per-particle percentage of variation to apply.
Neighbor influence

The neighbor influence extends outwards from the particle’s neighbors

  • Distance: particles within this distance will be fully affected.

  • Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

  • Relative to mass: the force applied to a particle will be relative to its mass.

Simulation groups

  • Simulation groups: only neighbors with matching simulation groups will be considered.

Obstacles

  • Object list: the obstacle objects.

Proximity Avoidance

  • Direction %: the percentage of avoidance direction each particle will adopt.

  • Variation %: the per-particle percentage of variation to apply.
Proximity influence

The proximity influence extends outwards from the surface of nearby obstacles.

  • Distance: particles within this distance will be fully affected.

  • Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

Raycast Avoidance

  • Direction %: the percentage of avoidance direction each particle will adopt.

  • Variation %: the per-particle percentage of variation to apply.
Proximity influence

The proximity influence extends outwards from the surface of obstacles hit by raycasts.

  • Distance: particles within this distance will be fully affected.

  • Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

  • Ignore backfaces: rays that hit backfaces of obstacles will be ignored.