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ObjectParticles Class

Interface for object particles handling. See also the UnigineScript analog.

To use this class, include the UnigineObjectParticles.h file.

ObjectParticles Class

Members


ObjectParticles ()

Constructor. Creates a particle system.

void setLengthFlattening (float flattening)

Sets a factor of the linear interpolation between the Z axis and the camera direction for the length particles.

Arguments

  • float flattening - A flattening factor. If a negative value is provided, 0 will be used instead.

float getRotationMean ()

Returns the current mean value of the angles at which the emitted particles are rotated.

Return value

The mean value in degrees.

void setSpawnRate (float rate)

Sets a rate at which particles are created.

Arguments

  • float rate - A new spawn rate. If a too small value is provided, 1E-6 will be used instead.

void setForceAttractor (int num, float attractor)

Sets the attraction force that will be applied to the particles in the specified force radius.

Arguments

  • int num - The attraction force number.
  • float attractor - The force value.

int getDeflectorType (int num)

Returns a type of a given deflector.

Arguments

  • int num - The deflector number.

Return value

DEFLECTOR_REFLECTOR or DEFLECTOR_CLIPPER.

float getDurationMean ()

Returns the current mean value of particle emission intervals.

Return value

The mean value in seconds.

float getLengthStretch ()

Returns the current factor, by which length particles are stretched.

Return value

The current stretch factor.

void setWarming (int warming)

Enables the warm start for the particles. It means that the particle system starts to be rendered with already emitted particles, rather then from a zero point.

Arguments

  • int warming - 1 to enable the warm start; 0 to disable it.

void setDeflectorRestitution (int num, float restitution)

Sets restitution of the deflector. Makes sense only for reflectors.

Arguments

  • int num - The deflector number.
  • float restitution - A new restitution. The provided value will be saturated in the range [0; 1].

float getGrowthDamping ()

Returns the current damping of particles growth in size.

Return value

The current growth damping.

void setNoiseStep (int num, const Math::vec3 & step)

Sets the Step parameter coordinates values for the required noise.

Arguments

  • int num - The target noise number.
  • const Math::vec3 & step - Step coordinates values.

Math::vec3 getContactVelocity (int num)

Returns the velocity in the collision point of the particles with other objects.

Arguments

  • int num - The collision point number.

Return value

Velocity values for each of space dimensions.

void setNoiseAttached (int num, int attached)

Sets the noise as an attached.

Arguments

  • int num - The target noise number.
  • int attached - 1 to enable the Attached flag, 0 to disable it.

float getPhysicalMass ()

Returns the current mass of the particles. This value matters only for computing physical interactions.

Return value

The mass of the particles.

void setDeflectorRoughness (int num, float roughness)

Sets roughness of the deflector surface. Makes sense only for reflectors.

Arguments

  • int num - The deflector number.
  • float roughness - A new roughness. The provided value will be saturated in the range [0; 1].

void setSpawnThreshold (float threshold)

Sets the velocity threshold for spark and random emitters. They spawn particles if the velocity value of the parent particles is high enough.

Arguments

  • float threshold - A velocity threshold for the parent particles.

void setEmitterSync (int sync)

Sets a value indicating if a particle system emitter needs to be synchronized to a parent particle system.

Arguments

  • int sync - 1 to synchronize the emitter; otherwise, 0.

void getParticleTransforms (Vector< Math::Mat4 > & transforms)

Returns transformation matrices for spawned particles.

Arguments

  • Vector< Math::Mat4 > & transforms - Array to which the transformation matrices will be added.

int getDepthSort ()

Returns a value indicating if depth sorting of particles is enabled. The depth sorting is required, if particles use alpha blending.

Return value

1 if the depth sorting is enabled; otherwise, 0.

void setDeflectorAttached (int num, int attached)

Attaches or detaches a given deflector to the particle system.

Arguments

  • int num - The deflector number.
  • int attached - 1 to attach the deflector, 0 to detach it.

float getDelayMean ()

Returns the mean value of particles initialization delay relative to the parent particle system.

Return value

The mean value in seconds.

int isDeflectorAttached (int num)

Returns a value indicating if a given deflector is attached to the particle system.

Arguments

  • int num - The deflector number.

Return value

1 if the deflector is attached; otherwise, 0.

void setEmitterVelocity (const Math::vec3 & velocity)

Sets an emitter velocity, which is added to the initial velocity of spawned particles. If the value equals 0, the actual velocity of emitter node will be used.

Arguments

  • const Math::vec3 & velocity - An emitter velocity in units per second.

float getForceAttractor (int num)

Returns the current attraction force applied to the particles in the specified force radius.

Arguments

  • int num - The attraction force number.

Return value

The force value.

Math::vec3 getEmitterVelocity ()

Returns the current emitter velocity, which is added to the initial velocity of spawned particles. If the value equals 0, the actual velocity of emitter node will be used.

Return value

The emitter velocity in units per second.

int addNoise ()

Adds a new noise with default settings.

Return value

The number of the new noise in the list of noises.

int getEmitterSequence ()

Returns the current rendering order of the particle system inside the particles hierarchy.

Return value

The current rendering priority.

float getLifeMean ()

Returns the current mean value of particle lifetime duration.

Return value

The mean value in seconds.

int isNoiseAttached (int num)

Returns a value indicating if the given noise is attached to the particle system.

Arguments

  • int num - The target noise number.

Return value

1 if the noise is attached; otherwise, 0.

void setNoiseOffset (int num, const Math::vec3 & offset)

Sets the Offset parameter coordinates values for the required noise.

Arguments

  • int num - The target noise number.
  • const Math::vec3 & offset - Offset coordinates values.

float getSpawnThreshold ()

Returns the current velocity threshold for spark and random emitters. They spawn particles if velocity of the parent particles is high enough.

Return value

The current velocity threshold of the parent particles.

float getForceRadius (int num)

Returns the current radius set for applying the force.

Arguments

  • int num - The force number.

Return value

The current radius in units.

void setEmitterBased (int based)

Sets a value indicating if particles should follow emitter transformations, i.e. the direction of their flow should change after the emitter.

Arguments

  • int based - 1 for particles to follow emitter transformations; 0 for them to flow independently.

void setIntersection (int intersection)

Enables or disables detecting collision by the center of the sphere that approximates the particles. This method is faster than collision detection, but less precise.

Arguments

  • int intersection - 1 to detect intersections, 0 not to detect.

Math::vec3 getGravity ()

Returns the current gravity force influencing particles.

Return value

The current gravity force.

Math::vec3 getEmitterDirection ()

Returns the current direction of particles emission along the axes.

Return value

The current emission direction.

float getLinearDamping ()

Returns the current linear damping of particles.

Return value

The current linear damping.

void setRadius (float mean, float spread)

Sets a particle radius in units.

Arguments

  • float mean - A mean value in units. If a too small value is provided, 1E-6 will be used instead.
  • float spread - A spread value in units.

void setVariationX (int variationx)

Sets a value indicating if the initial orientation of particles diffuse texture should be randomly varied along the X axis.

Arguments

  • int variationx - 1 to add random variation along the X axis, 0 not to add.

int addDeflector ()

Adds a deflector with default settings.

Return value

The number of the new deflector in the list of deflectors.

float getGrowthMean ()

Returns the current mean value of the particle growth factor.

Return value

The mean value.

float getSpawnScale ()

Returns the current spawn scale that enables to modulate smooth and gradual initialization of the particle system starting with the given spawn state and up to the specified spawn rate.

Return value

The current spawn scale.

void setCollision (int collision)

Enables or disables detecting collision by the outer surface of the sphere that approximates the particles (each particle is approximated with the sphere). This method is slower than intersection detection, but more precise.

Arguments

  • int collision - 1 to enable sphere-based collision detection, 0 to disable it.

int isNoiseEnabled (int num)

Returns a value indicating if the given noise is enabled.

Arguments

  • int num - The target noise number.

Return value

1 if the noise is enabled; otherwise, 0.

int getNumParticles ()

Returns the current number of particles.

Return value

The number of particles.

float getParticleRadius (int num)

Returns the radius of a given particle.

Arguments

  • int num - The particle number.

Return value

Radius of the particle.

float getAngularDamping ()

Returns the current angular damping of particles.

Return value

The current angular damping.

void setRoughness (float roughness)

Sets a roughness of the particle surface.

Arguments

  • float roughness - A new roughness value. The provided value will be saturated in the range [0; 1].

int getIntersection ()

Returns a value indicating if collision is detected by the center of the sphere that approximates the particles. This method is faster than sphere-based collision detection, but less precise.

Return value

1 if the sphere center-based intersection detection is enabled; otherwise, 0.

int getNumDeflectors ()

Returns the current number of deflectors.

Return value

The number of deflectors.

float getLengthFlattening ()

Returns the current factor of the linear interpolation between the Z axis and the camera direction for the length particles.

Return value

The current flattening factor.

int getEmitterSync ()

Returns a value indicating if a particle system emitter is synchronized to a parent particle system.

Return value

1 if it is synchronized; otherwise, 0.

float getForceRotator (int num)

Returns the current rotation force applied to the particles in the specified force radius.

Arguments

  • int num - The rotation force number.

Return value

The force value.

void setEmitterType (int type)

Sets a type of the emitter.

Arguments

  • int type - The type of the emitter (one of the EMITTER_* values).

void setEmitterSequence (int sequence)

Sets the rendering order of the particle system inside the particles hierarchy.

Arguments

  • int sequence - The rendering priority. Particle systems with the lowest order number are rendered first.

int getEmitterLimit ()

Returns the current maximum number of particles that an emitter can possibly spawn per one frame.

Return value

The maximum possible number of particles.

float getForceAttenuation (int num)

Returns the current attenuation factor for the specified force.

Arguments

  • int num - The force number.

Return value

The current attenuation factor.

unsigned int getSeed ()

Returns the seed value used for the particles' random generator.

Return value

The seed value.

void setEmitterContinuous (int continuous)

Sets a value indicating if additional spawn points should be generated when the emitter is moved, which provides a continuous flow of particles.

Arguments

  • int continuous - 1 to create the continuous flow of particles; 0 to create the discrete flow with sparse generation points.

float getNoiseScale (int num)

Returns the Scale parameter value for the required noise.

Arguments

  • int num - The target noise number.

Return value

The noise scale value.

void setNumNoises (int noises)

Sets the new number of noises.

Arguments

  • int noises - Number of noises.

void addEmitterSpark (const Math::Vec3 & point, const Math::vec3 & normal, const Math::vec3 & velocity)

Adds a spark emitter in the given point.

Arguments

  • const Math::Vec3 & point - Point for sparks emission.
  • const Math::vec3 & normal - Normal vector of the point of spark emission.
  • const Math::vec3 & velocity - Velocity in the point of spark emission (velocity of source particles or node by contact).

float getDeflectorRestitution (int num)

Returns the current restitution of the deflector. Makes sense only for reflectors.

Arguments

  • int num - The deflector number.

Return value

The current restitution.

void setDelay (float mean, float spread)

Sets delay of particle system initialization relative to the parent particle one.

Arguments

  • float mean - A mean value in seconds. If a negative value is provided, 0 will be used instead.
  • float spread - A spread value in seconds.

void setPeriod (float mean, float spread)

Sets an interval of emitter inactivity in seconds.

Arguments

  • float mean - A mean value in seconds. If a negative value is provided, 0 will be used instead.
  • float spread - A spread value in seconds.

Ptr<Image> getNoiseImage (int num)

Returns the spatial texture for the required noise.

Arguments

  • int num - The target noise number.

Return value

The texture of the noise.

void setDeflectorTransform (int num, const Math::Mat4 & transform)

Sets a transformation matrix for a given deflector. This matrix describes the position and orientation of the deflector.

Arguments

  • int num - The deflector number.
  • const Math::Mat4 & transform - A new transformation matrix.

void setForceRadius (int num, float radius)

Sets a radius for applying the force.

Arguments

  • int num - The force number.
  • float radius - A radius in units. If a negative value is provided, 0 will be used instead.

int isEmitterBased ()

Returns a value indicating if particles follow emitter transformations, i.e. the direction of their flow changes after the emitter.

Return value

1 if particles follow emitter transformations; otherwise, 0.

Math::Mat4 getForceTransform (int num)

Returns the current transformation matrix for the specified force.

Arguments

  • int num - The force number.

Return value

The transformation matrix.

void setNoiseForce (int num, float force)

Sets the Force parameter value for the required noise.

Arguments

  • int num - The target noise number.
  • float force - The noise force value.

int getPhysicalMask ()

Returns the bit mask for interactions with physicals. Two objects interact, if they both have matching masks.

Return value

Integer, each bit of which is a mask.

int addForce ()

Adds a force with default settings.

Return value

The number of the new force in the list of forces.

void removeNoise (int num)

Removes the given noise.

Arguments

  • int num - The target noise number.

void setEmitterEnabled (int enabled)

Enables or disables particle emission.

Arguments

  • int enabled - 1 to enable particle emission, 0 to disable it.

float getRadiusMean ()

Returns the current mean value of particle radii.

Return value

The mean value in units.

int getParticlesType ()

Returns the type of emitted particles.

Return value

The type of particles (one of the TYPE_* values).

void setGrowth (float mean, float spread)

Sets a particle growth factor.

Arguments

  • float mean - A mean value.
  • float spread - A spread value.

void setParticlesType (int type)

Sets a type of particles to emit.

Arguments

  • int type - A type of particles (one of the TYPE_* values).

void setEmitterLimit (int limit)

Sets the maximum number of particles that an emitter can possibly spawn per one frame.

Arguments

  • int limit - The maximum possible number of particles. If a negative value is provided, 0 will be used instead.

float getRestitution ()

Returns the current restitution value for particles.

Return value

The current restitution value.

int isEmitterShift ()

Returns a value indicating if the emitter spawns particles only when it is moving. The further it has moved, if compared to its position in the previous frame, the more particles will be spawned. If the emitter is not moving, there are no particles at all.

Return value

1 if the shift-based spawning is enabled; 0 if it is not.

void removeDeflector (int num)

Removes a given point deflector.

Arguments

  • int num - The number of the deflector to remove.

void setForceAttached (int num, int attached)

Attaches or detaches the given force to the particle system.

Arguments

  • int num - The force number.
  • int attached - 1 to attach the force, 0 to detach it.

float getSpawnRate ()

Returns the current particle spawn rate.

Return value

The current spawn rate.

Math::Mat4 getDeflectorTransform (int num)

Returns the transformation matrix of a given deflector. This matrix describes the position and orientation of the deflector. The default is the identity matrix.

Arguments

  • int num - The deflector number.

Return value

The transformation matrix.

int getNoiseSize (int num)

Returns the Size parameter value for the required noise.

Arguments

  • int num - The target noise number.

Return value

The noise size value.

void setCulling (int culling)

Sets a value indicating if particles should disappear upon collision or intersection.

Arguments

  • int culling - 1 to make particles disappear; 0 to continue rendering of particles after collision/intersection.

int isForceEnabled (int num)

Returns a value indicating if the given force is enabled.

Arguments

  • int num - The force number.

Return value

1 if the force is enabled; otherwise, 0.

void setNumForces (int forces)

Sets the new number of forces.

Arguments

  • int forces - Number of forces.

int getNumNoises ()

Returns the current number of noises.

Return value

Number of noises.

float getRadiusSpread ()

Returns the current spread value of particle radii.

Return value

The spread value in units.

void setDepthSort (int sort)

Enables or disables depth sorting of particles. The depth sorting is required, if particles use alpha blending.

Arguments

  • int sort - 1 to enable the depth sorting, 0 to disable it.

float getPeriodSpread ()

Returns the current spread value of emitter inactivity intervals.

Return value

The spread value in seconds.

void setPhysicalMass (float mass)

Sets the mass of the particles. This value matters only for computing physical interactions.

Arguments

  • float mass - The mass of the particles.

void setTextureAtlas (int atlas)

Sets a value indicating if a diffuse texture for the particles is a 4x4 texture atlas.

Arguments

  • int atlas - 1 if a texture atlas is used; 0 if an ordinary diffuse texture is assigned.

void removeForce (int num)

Removes the given force.

Arguments

  • int num - The number of the force to remove.

float getDurationSpread ()

Returns the current spread value of particle emission intervals.

Return value

The spread value in seconds.

void setNumDeflectors (int deflectors)

Sets the new number of deflectors.

Arguments

  • int deflectors - Number of deflectiors.

Math::vec3 getDeflectorSize (int num)

Returns the current dimensions of the given deflector.

Arguments

  • int num - The deflector number.

Return value

The current dimensions. Only the first two components should be taken into account (x and y).

void setNoiseTransform (int num, const Math::Mat4 & transform)

Sets the transformation matrix for the required noise.

Arguments

  • int num - The target noise number.
  • const Math::Mat4 & transform - The noise transformation matrix.

void setEmitterSpread (const Math::vec3 & spread)

Sets a spread of particles emission along the axes.

Arguments

  • const Math::vec3 & spread - A spread of particles emission.

int isEmitterContinuous ()

Returns a value indicating if additional spawn points are generated when the emitter is moved, which provides a continuous flow of particles.

Return value

1 if particles are created in the continuous flow; otherwise, 0.

void setVelocity (float mean, float spread)

Sets an initial particle velocity in units per second.

Arguments

  • float mean - A mean value in units per second.
  • float spread - A spread value in units per second.

float getDelaySpread ()

Returns the spread value of particles initialization delay relative to the parent particle system.

Return value

The spread value in seconds.

float getDeflectorRoughness (int num)

Returns the current roughness of the deflector. Makes sense only for reflectors.

Arguments

  • int num - The deflector number.

Return value

The current roughness.

float getVelocitySpread ()

Returns the current spread value of the initial particle velocities.

Return value

The spread value in units per second.

void setDuration (float mean, float spread)

Sets a duration of each particle emission in seconds.

Arguments

  • float mean - A mean value in seconds. If a negative value is provided, 0 will be used instead.
  • float spread - A spread value in seconds.

void setNoiseScale (int num, float scale)

Sets the Scale parameter value for the required noise.

Arguments

  • int num - The target noise number.
  • float scale - The noise scale value.

Math::vec3 getNoiseStep (int num)

Returns the Step parameter coordinates values for the required noise.

Arguments

  • int num - The target noise number.

Return value

Step coordinates values.

void setLinearDamping (float damping)

Sets a linear damping of particles.

Arguments

  • float damping - a new linear damping. If a negative value is provided, 0 will be used instead.

float getRotationSpread ()

Returns the current spread value of the angles at which the emitted particles are rotated.

Return value

The spread value in degrees.

void setPhysicalMask (int mask)

Sets a bit mask for interactions with physicals. Two objects interact, if they both have matching masks.

Arguments

  • int mask - Integer, each bit of which is a mask.

void setRotation (float mean, float spread)

Sets an angle (in degrees) at which the emitted particles should be rotated.

Arguments

  • float mean - The mean value in degrees.
  • float spread - The spread value in degrees.

void clearParticles ()

Deletes all particles spawned by the emitter.

float getAngleMean ()

Returns the mean value of the emission angle.

Return value

The mean value in degrees.

void setForceRotator (int num, float rotator)

Sets a rotation force that will be applied to the particles in the specified force radius.

Arguments

  • int num - The rotation force number.
  • float rotator - The force value.

void setEmitterSize (const Math::vec3 & size)

Sets a size of the emitter.

Arguments

  • const Math::vec3 & size - A new emitter size. If negative values are provided, 0 will be used instead of them. Depending on the type of the emitter, this value is interpreted as follows:
    • EMITTER_POINT, EMITTER_SPARK, EMITTER_RANDOM: all vector components are ignored.
    • EMITTER_SPHERE: the first vector component is the radius of the sphere.
    • EMITTER_CYLINDER: the first vector component is the radius of the cylinder, the second vector component is the height of the cylinder.
    • EMITTER_BOX: all vector components are interpreted as box dimensions (x, y, z).

int isEmitterEnabled ()

Returns a value indicating if particle emission is enabled.

Return value

1 if emission is enabled; otherwise, 0.

Math::vec3 getNoiseOffset (int num)

Returns the Offset parameter coordinates values for the required noise.

Arguments

  • int num - The target noise number.

Return value

Offset coordinates values.

float getLifeSpread ()

Returns the current spread value of particle lifetime duration.

Return value

The spread value in seconds.

void setGravity (const Math::vec3 & gravity)

Sets a gravity force influencing particles.

Arguments

  • const Math::vec3 & gravity - A gravity force.

float getRoughness ()

Returns the current roughness of the particle surface.

Return value

The current roughness.

int getNumForces ()

Returns the number of the currently acting forces.

Return value

The number of forces.

int isForceAttached (int num)

Returns a value indicating if the given force is attached to the particle system.

Arguments

  • int num - The force number.

Return value

1 if the force is attached; otherwise, 0.

void setVariationY (int variationy)

Sets a value indicating if the initial orientation of particles diffuse texture should be randomly varied along the Y axis.

Arguments

  • int variationy - 1 to add random variation along the Y axis, 0 not to add.

void setLengthStretch (float stretch)

Sets a factor by which length particles will be stretched.

Arguments

  • float stretch - A stretch factor. If a negative value is provided, 0 will be used instead.

void setAngle (float mean, float spread)

Sets an angle of emission.

Arguments

  • float mean - A mean value in degrees.
  • float spread - A spread value in degrees.

void setForceTransform (int num, const Math::Mat4 & transform)

Sets a transformation matrix for the specified force.

Arguments

  • int num - The force number.
  • const Math::Mat4 & transform - A transformation matrix.

void setRestitution (float restitution)

Sets a restitution value for particles.

Arguments

  • float restitution - A new restitution value. The provided value will be saturated in the range [0; 1].

float getGrowthSpread ()

Returns the current spread value of the particle growth factor.

Return value

The spread value.

float getPeriodMean ()

Returns the current mean value of emitter inactivity intervals.

Return value

The mean value in seconds.

int getEmitterType ()

Returns the type of the emitter.

Return value

The type of the emitter (one of the EMITTER_* values).

float getVelocityMean ()

Returns the current mean value of the initial particle velocities.

Return value

The mean value in units per second.

Math::Mat4 getNoiseTransform (int num)

Returns the transformation matrix for the required noise.

Arguments

  • int num - The target noise number.

Return value

The noise transformation matrix.

void setForceAttenuation (int num, float attenuation)

Sets an attenuation factor for the specified force.

Arguments

  • int num - The force number.
  • float attenuation - An attenuation factor.

Math::Vec3 getContactPoint (int num)

Returns the normal vector for the collision point of the particles with other objects.

Arguments

  • int num - The collision point number.

Return value

Normal vector coordinates.

int getCulling ()

Returns a value indicating if particles would disappear upon collision or intersection.

Return value

1 if particles would disappear; otherwise, 0.

Math::Vec3 getWorldOffset ()

Returns the current world offset of the local origin of coordinates of the particle system. The offset of the origin of coordinates is changed depending on the position of the particle system so that the particles are simulated near their emitter.

Return value

Offset coordinates values.

void setDeflectorType (int num, int type)

Sets a type of a given deflector.

Arguments

  • int num - The deflector number.
  • int type - DEFLECTOR_REFLECTOR or DEFLECTOR_CLIPPER.

void setEmitterShift (int shift)

Sets a value indicating if the emitter spawns particles only when it is moving. The further it has moved, if compared to its position in the previous frame, the more particles will be spawned. If the emitter is not moving, there are no particles at all.

Arguments

  • int shift - 1 to enable the shift-based spawning; 0 to disable it.

void setForceEnabled (int num, int enabled)

Enables or disables the given force.

Arguments

  • int num - The force number.
  • int enabled - 1 to enable the force, 0 to disable it.

Math::vec3 getEmitterSpread ()

Returns the current spread of particles emission along the axes.

Return value

The spread of particles emission.

void setNoiseFrequency (int num, int frequency)

Sets the Frequency parameter value for the required noise.

Arguments

  • int num - The target noise number.
  • int frequency - The noise frequency value.

void setDeflectorEnabled (int num, int enabled)

Enables or disables the given deflector.

Arguments

  • int num - The deflector number.
  • int enabled - 1 to enable the deflector, 0 to disable it.

Math::Vec3 getParticlePosition (int num)

Returns the position of a given particle.

Arguments

  • int num - The particle number.

Return value

Position coordinates for the particle.

int isDeflectorEnabled (int num)

Returns a value indicating if the given deflector is enabled.

Arguments

  • int num - The deflector number.

Return value

1 if the deflector is enabled; otherwise, 0.

void setDeflectorSize (int num, const Math::vec3 & size)

Sets dimensions of a given deflector.

Arguments

  • int num - The deflector number.
  • const Math::vec3 & size - New dimensions. Only the first two components are taken into account (x and y).

void setLife (float mean, float spread)

Sets a lifetime duration of particles in seconds.

Arguments

  • float mean - A mean value in seconds. If a too small value is provided, 1E-6 will be used instead.
  • float spread - A spread value in seconds.

void setSpawnScale (float scale)

Sets a spawn scale that enables to modulate smooth and gradual initialization of the particle system starting with the given spawn state and up to the specified spawn rate.

Arguments

  • float scale - A spawn scale. The provided value is clipped to range [0;1]. By the value of 0, there are no spawned particles at the start. By the value of 1, the system is initialized with the specified spawn rate.

int getTextureAtlas ()

Returns a value indicating if a diffuse texture for the particles is used as a 4x4 texture atlas.

Return value

1 if a texture atlas is used; otherwise, 0.

int getVariationX ()

Returns a value indicating if the initial orientation of particles diffuse texture is randomly varied along the X axis.

Return value

1 if there is random variation along the X axis, 0 if there is not.

int getVariationY ()

Returns a value indicating if the initial orientation of particles diffuse texture is randomly varied along the Y axis.

Return value

1 if there is random variation along the Y axis, 0 if there is not.

void setAngularDamping (float damping)

Sets an angular damping of particles.

Arguments

  • float damping - A new angular damping. If a negative value is provided, 0 will be used instead.

Math::vec3 getContactNormal (int num)

Returns the point of the particles collision with other objects.

Arguments

  • int num - The collision point number.

Return value

Collision point coordinates.

int getWarming ()

Returns a value indicating if the warm start is enabled for the particles. It means that the particle system starts to be rendered with already emitted particles, rather then from a zero point.

Return value

1 if the warm start is enabled; 0 if it is disabled.

float getNoiseForce (int num)

Returns the Force parameter value for the required noise.

Arguments

  • int num - The target noise number.

Return value

The noise force value.

Math::vec3 getEmitterSize ()

Returns the current emitter size.

Return value

The current size of the emitter. Depending on the type of the emitter, this value is interpreted as follows:
  • EMITTER_POINT, EMITTER_SPARK, EMITTER_RANDOM: all vector components are ignored.
  • EMITTER_SPHERE: the first vector component is the radius of the sphere.
  • EMITTER_CYLINDER: the first vector component is the radius of the cylinder, the second vector component is the height of the cylinder.
  • EMITTER_BOX: all vector components are interpreted as box dimensions (x, y, z).

void setSeed (unsigned int seed)

Sets a seed value for the particles' random generator.

Arguments

  • unsigned int seed - A seed value.

float getAngleSpread ()

Returns the spread value of the emission angle.

Return value

The spread value in degrees.

Math::vec3 getParticleVelocity (int num)

Returns the velocity vector for a specified particle.

Arguments

  • int num - The particle number.

Return value

The velocity vector.

int getCollision ()

Returns a value indicating if collision is detected by the outer surface of the sphere that approximates the particles. This method is slower than sphere center-based intersection detection, but more precise.

Return value

1 if the sphere-based collision detection is enabled; otherwise, 0.

void setNoiseSize (int num, int size)

Sets the Size parameter value for the required noise.

Arguments

  • int num - The target noise number.
  • int size - The noise size value.

void setEmitterDirection (const Math::vec3 & direction)

Sets the direction of particles emission along the axes.

Arguments

  • const Math::vec3 & direction - The emission direction.

void setGrowthDamping (float damping)

Sets the damping of particles growth in size.

Arguments

  • float damping - A new growth damping. If a negative value is provided, 0 will be used instead.

int getNoiseFrequency (int num)

Returns the Frequency parameter value for the required noise.

Arguments

  • int num - The target noise number.

Return value

The noise frequency value.

Ptr<Object> getContactObject (int num)

Returns the object that collided with particles collided in a given collision point.

Arguments

  • int num - The collision point number.

Return value

The object participated in collision.

int getNumContacts ()

Returns the total number of particles collisions with other objects.

Return value

Number of collisions.

void setNoiseEnabled (int num, int enabled)

Enables or disables the given noise.

Arguments

  • int num - The target noise number.
  • int enabled - 1 to enable the noise, 0 to disable it.

int TYPE_BILLBOARD

Description

Particles of this type are camera-oriented and rotating.

int TYPE_FLAT

Description

Particles of this type are perpendicular to the z-axis of their particle system.

int TYPE_POINT

Description

Particles of this type are similar to billboard particles, but do not rotate.

int TYPE_LENGTH

Description

Particles of this type are similar to billboard particles, but stretched along the direction of their motion and do not rotate.

int TYPE_RANDOM

Description

Particles of this type are arbitrary oriented ones.

int TYPE_ROUTE

Description

Particles of this type can be used to create tracks from moving objects (for example, foam after a ship). Each Route particle is flat (just like flat particles), but is oriented on the plane in the same way as the emitter when it spawned it.

int TYPE_CHAIN

Description

Particles of this type are camera-oriented and connected with each other at vertices forming continuous flow.

int EMITTER_POINT

Description

Point emitter. Particles are emitted from one single point.

int EMITTER_SPHERE

Description

Sphere emitter. Particles are emitted from a random point of the sphere.

int EMITTER_CYLINDER

Description

Cylinder emitter. Particles are emitted from a random point of the cylinder.

int EMITTER_BOX

Description

Box emitter. Particles are emitted from a random point of the box.

int EMITTER_RANDOM

Description

Arbitrary emitter. Particles are emitted from a random point of their parent node. With an emitter of this type you can create particles, which spawn particles themselves.

int EMITTER_SPARK

Description

Spark emitter. Particles are emitted from a single point and imitate sparks.

int DEFLECTOR_REFLECTOR

Description

When a particle hits a deflector of this type, the particle bounces off it.

int DEFLECTOR_CLIPPER

Description

When a particle hits a deflector of this type, the particle is removed.
Last update: 2017-07-03