Class b2ParticleSystemDef

Determines how fast colors are mixed 1.0f ==> mixed immediately 0.5f ==> mixed half way each simulation step (see b2World::Step())

Reduces velocity along the collision normal Smaller value reduces less

Set the particle density. See SetDensity for details.

Whether to destroy particles by age when no more particles can be created. See #b2ParticleSystem::SetDestructionByAge() for more information.

Pushes particles out of solid particle group Larger values repulse more

Restores shape of elastic particle groups Larger values increase elastic particle velocity

Change the particle gravity scale. Adjusts the effect of the global gravity vector on particles. Default value is 1.0f.

Granularity of particle lifetimes in seconds. By default this is set to (1.0f / 60.0f) seconds. b2ParticleSystem uses a 32-bit signed value to track particle lifetimes so the maximum lifetime of a particle is (2^32 - 1) / (1.0f / lifetimeGranularity) seconds. With the value set to 1/60 the maximum lifetime or age of a particle is 2.27 years.

Set the maximum number of particles. By default, there is no maximum. The particle buffers can continue to grow while b2World's block allocator still has memory. See SetMaxParticleCount for details.

Produces repulsion between powder particles Larger values repulse more

Increases pressure in response to compression Smaller values allow more compression

Particles behave as circles with this radius. In Box2D units.

Produces additional pressure on repulsive particles Larger values repulse more Negative values mean attraction. The range where particles behave stably is about -0.2 to 2.0.

Restores length of spring particle groups Larger values increase spring particle velocity

Computes static pressure more precisely See SetStaticPressureIterations for details

Reduces instability in static pressure calculation Larger values make stabilize static pressure with fewer iterations

Produces static pressure Larger values increase the pressure on neighboring partilces For a description of static pressure, see http://en.wikipedia.org/wiki/Static_pressure#Static_pressure_in_fluid_dynamics

Enable strict Particle/Body contact check. See SetStrictContactCheck for details.

Smoothes outline of tensile particles 0~0.2. Larger values result in rounder, smoother, water-drop-like clusters of particles.

Produces pressure on tensile particles 0~0.2. Larger values increase the amount of surface tension.

Reduces relative velocity of viscous particles Larger values slow down viscous particles more