Struct liquidfun::box2d::particle::particle_system::ParticleSystemDef
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pub struct ParticleSystemDef {
pub strict_contact_check: bool,
pub density: Float32,
pub gravity_scale: Float32,
pub radius: Float32,
pub max_count: Int32,
pub pressure_strength: Float32,
pub damping_strength: Float32,
pub elastic_strength: Float32,
pub spring_strength: Float32,
pub viscous_strength: Float32,
pub surface_tension_pressure_strength: Float32,
pub surface_tension_normal_strength: Float32,
pub repulsive_strength: Float32,
pub powder_strength: Float32,
pub ejection_strength: Float32,
pub static_pressure_strength: Float32,
pub static_pressure_relaxation: Float32,
pub static_pressure_iterations: Int32,
pub color_mixing_strength: Float32,
pub destroy_by_age: bool,
pub lifetime_granularity: Float32,
}Fields
strict_contact_check | Enable strict Particle/Body contact check. See SetStrictContactCheck for details. |
density | Set the particle density. See SetDensity for details. |
gravity_scale | Change the particle gravity scale. Adjusts the effect of the global gravity vector on particles. Default value is 1.0f. |
radius | Particles behave as circles with this radius. In Box2D units. |
max_count | 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. |
pressure_strength | Increases pressure in response to compression Smaller values allow more compression |
damping_strength | Reduces velocity along the collision normal Smaller value reduces less |
elastic_strength | Restores shape of elastic particle groups Larger values increase elastic particle velocity |
spring_strength | Restores length of spring particle groups Larger values increase spring particle velocity |
viscous_strength | Reduces relative velocity of viscous particles Larger values slow down viscous particles more |
surface_tension_pressure_strength | Produces pressure on tensile particles 0~0.2. Larger values increase the amount of surface tension. |
surface_tension_normal_strength | Smoothes outline of tensile particles 0~0.2. Larger values result in rounder, smoother, water-drop-like clusters of particles. |
repulsive_strength | 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. |
powder_strength | Produces repulsion between powder particles Larger values repulse more |
ejection_strength | Pushes particles out of solid particle group Larger values repulse more |
static_pressure_strength | 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 |
static_pressure_relaxation | Reduces instability in static pressure calculation Larger values make stabilize static pressure with fewer iterations |
static_pressure_iterations | Computes static pressure more precisely See SetStaticPressureIterations for details |
color_mixing_strength | Determines how fast colors are mixed 1.0f ==> mixed immediately 0.5f ==> mixed half way each simulation step (see b2World::Step()) |
destroy_by_age | Whether to destroy particles by age when no more particles can be created. See #b2ParticleSystem::SetDestructionByAge() for more information. |
lifetime_granularity | 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 (232 - 1) / (1.0f / lifetimeGranularity) seconds. With the value set to 1/60 the maximum lifetime or age of a particle is 2.27 years. |