Collisions

This layer provides particle to particle collisions.

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Collisions tab menu.

Check this box to enable collision constraints.

This controls how stiff the collision is.

Essentially, a dynamic ‘spring’ is created to keep the particles apart (keeping them from intersecting).

This animation demonstrates how the Stiffness parameter keeps particles from intersecting at higher values.

Set as All, by default.

The alternatives are: Same Group and Different Groups.

Collisions between particles will occur regardless of what group the particles are in.

Collisions will only occur between particles in the same group.

Collisions will only occur between particles in different groups.

If enabled, collisions will take place between particles emitted from the same emitter and between particles from different emitters.

If it is unchecked, collisions will only take place between particles emitted from different emitters.

This setting alters the influence each constraint type provides to the overall solution.