CPUParticles

CPUParticles

Inherits: GeometryInstance < VisualInstance < CullInstance < Spatial < Node < Object

CPU-based 3D particle emitter.

Description

CPU-based 3D particle node used to create a variety of particle systems and effects.

See also Particles, which provides the same functionality with hardware acceleration, but may not run on older devices.

Note: Unlike Particles, the visibility rect is generated on-the-fly and doesn’t need to be configured by the user.

Properties

int	amount	`8`
float	angle	`0.0`
Curve	angle_curve
float	angle_random	`0.0`
float	angular_velocity	`0.0`
Curve	angular_velocity_curve
float	angular_velocity_random	`0.0`
float	anim_offset	`0.0`
Curve	anim_offset_curve
float	anim_offset_random	`0.0`
float	anim_speed	`0.0`
Curve	anim_speed_curve
float	anim_speed_random	`0.0`
Color	color	`Color( 1, 1, 1, 1 )`
Gradient	color_initial_ramp
Gradient	color_ramp
float	damping	`0.0`
Curve	damping_curve
float	damping_random	`0.0`
Vector3	direction	`Vector3( 1, 0, 0 )`
DrawOrder	draw_order	`0`
Vector3	emission_box_extents
PoolColorArray	emission_colors
PoolVector3Array	emission_normals
PoolVector3Array	emission_points
Vector3	emission_ring_axis
float	emission_ring_height
float	emission_ring_inner_radius
float	emission_ring_radius
EmissionShape	emission_shape	`0`
float	emission_sphere_radius
bool	emitting	`true`
float	explosiveness	`0.0`
int	fixed_fps	`0`
bool	flag_align_y	`false`
bool	flag_disable_z	`false`
bool	flag_rotate_y	`false`
float	flatness	`0.0`
bool	fract_delta	`true`
Vector3	gravity	`Vector3( 0, -9.8, 0 )`
float	hue_variation	`0.0`
Curve	hue_variation_curve
float	hue_variation_random	`0.0`
float	initial_velocity	`0.0`
float	initial_velocity_random	`0.0`
float	lifetime	`1.0`
float	lifetime_randomness	`0.0`
float	linear_accel	`0.0`
Curve	linear_accel_curve
float	linear_accel_random	`0.0`
bool	local_coords	`true`
Mesh	mesh
bool	one_shot	`false`
float	orbit_velocity
Curve	orbit_velocity_curve
float	orbit_velocity_random
float	preprocess	`0.0`
float	radial_accel	`0.0`
Curve	radial_accel_curve
float	radial_accel_random	`0.0`
float	randomness	`0.0`
float	scale_amount	`1.0`
Curve	scale_amount_curve
float	scale_amount_random	`0.0`
float	speed_scale	`1.0`
float	spread	`45.0`
float	tangential_accel	`0.0`
Curve	tangential_accel_curve
float	tangential_accel_random	`0.0`

Methods

void	convert_from_particles ( Node particles )
float	get_param ( Parameter param ) const
Curve	get_param_curve ( Parameter param ) const
float	get_param_randomness ( Parameter param ) const
bool	get_particle_flag ( Flags flag ) const
void	restart ( )
void	set_param ( Parameter param, float value )
void	set_param_curve ( Parameter param, Curve curve )
void	set_param_randomness ( Parameter param, float randomness )
void	set_particle_flag ( Flags flag, bool enable )

Enumerations

enum DrawOrder:

DRAW_ORDER_INDEX = 0 —- Particles are drawn in the order emitted.
DRAW_ORDER_LIFETIME = 1 —- Particles are drawn in order of remaining lifetime.
DRAW_ORDER_VIEW_DEPTH = 2 —- Particles are drawn in order of depth.

enum Parameter:

PARAM_INITIAL_LINEAR_VELOCITY = 0 —- Use with set_param, set_param_randomness, and set_param_curve to set initial velocity properties.
PARAM_ANGULAR_VELOCITY = 1 —- Use with set_param, set_param_randomness, and set_param_curve to set angular velocity properties.
PARAM_ORBIT_VELOCITY = 2 —- Use with set_param, set_param_randomness, and set_param_curve to set orbital velocity properties.
PARAM_LINEAR_ACCEL = 3 —- Use with set_param, set_param_randomness, and set_param_curve to set linear acceleration properties.
PARAM_RADIAL_ACCEL = 4 —- Use with set_param, set_param_randomness, and set_param_curve to set radial acceleration properties.
PARAM_TANGENTIAL_ACCEL = 5 —- Use with set_param, set_param_randomness, and set_param_curve to set tangential acceleration properties.
PARAM_DAMPING = 6 —- Use with set_param, set_param_randomness, and set_param_curve to set damping properties.
PARAM_ANGLE = 7 —- Use with set_param, set_param_randomness, and set_param_curve to set angle properties.
PARAM_SCALE = 8 —- Use with set_param, set_param_randomness, and set_param_curve to set scale properties.
PARAM_HUE_VARIATION = 9 —- Use with set_param, set_param_randomness, and set_param_curve to set hue variation properties.
PARAM_ANIM_SPEED = 10 —- Use with set_param, set_param_randomness, and set_param_curve to set animation speed properties.
PARAM_ANIM_OFFSET = 11 —- Use with set_param, set_param_randomness, and set_param_curve to set animation offset properties.
PARAM_MAX = 12 —- Represents the size of the Parameter enum.

enum Flags:

FLAG_ALIGN_Y_TO_VELOCITY = 0 —- Use with set_particle_flag to set flag_align_y.
FLAG_ROTATE_Y = 1 —- Use with set_particle_flag to set flag_rotate_y.
FLAG_DISABLE_Z = 2 —- Use with set_particle_flag to set flag_disable_z.
FLAG_MAX = 3 —- Represents the size of the Flags enum.

enum EmissionShape:

EMISSION_SHAPE_POINT = 0 —- All particles will be emitted from a single point.
EMISSION_SHAPE_SPHERE = 1 —- Particles will be emitted in the volume of a sphere.
EMISSION_SHAPE_BOX = 2 —- Particles will be emitted in the volume of a box.
EMISSION_SHAPE_POINTS = 3 —- Particles will be emitted at a position chosen randomly among emission_points. Particle color will be modulated by emission_colors.
EMISSION_SHAPE_DIRECTED_POINTS = 4 —- Particles will be emitted at a position chosen randomly among emission_points. Particle velocity and rotation will be set based on emission_normals. Particle color will be modulated by emission_colors.
EMISSION_SHAPE_RING = 5 —- Particles will be emitted in a ring or cylinder.
EMISSION_SHAPE_MAX = 6 —- Represents the size of the EmissionShape enum.

Property Descriptions

int amount

Default	`8`
Setter	set_amount(value)
Getter	get_amount()

The number of particles emitted in one emission cycle (corresponding to the lifetime).

Note: Changing amount will reset the particle emission, therefore removing all particles that were already emitted before changing amount.

float angle

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Initial rotation applied to each particle, in degrees.

Curve angle_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s rotation will be animated along this Curve.

float angle_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Rotation randomness ratio.

float angular_velocity

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Initial angular velocity applied to each particle in degrees per second. Sets the speed of rotation of the particle.

Curve angular_velocity_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s angular velocity will vary along this Curve.

float angular_velocity_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Angular velocity randomness ratio.

float anim_offset

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Particle animation offset.

Curve anim_offset_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s animation offset will vary along this Curve.

float anim_offset_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Animation offset randomness ratio.

float anim_speed

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Particle animation speed.

Curve anim_speed_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s animation speed will vary along this Curve.

float anim_speed_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Animation speed randomness ratio.

Color color

Default	`Color( 1, 1, 1, 1 )`
Setter	set_color(value)
Getter	get_color()

Each particle’s initial color. To have particle display color in a SpatialMaterial make sure to set SpatialMaterial.vertex_color_use_as_albedo to true.

Gradient color_initial_ramp

Setter	set_color_initial_ramp(value)
Getter	get_color_initial_ramp()

Each particle’s initial color will vary along this GradientTexture (multiplied with color).

Gradient color_ramp

Setter	set_color_ramp(value)
Getter	get_color_ramp()

Each particle’s color will vary along this GradientTexture over its lifetime (multiplied with color).

float damping

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

The rate at which particles lose velocity.

Curve damping_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Damping will vary along this Curve.

float damping_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Damping randomness ratio.

Vector3 direction

Default	`Vector3( 1, 0, 0 )`
Setter	set_direction(value)
Getter	get_direction()

Unit vector specifying the particles’ emission direction.

DrawOrder draw_order

Default	`0`
Setter	set_draw_order(value)
Getter	get_draw_order()

Particle draw order. Uses DrawOrder values.

Vector3 emission_box_extents

Setter	set_emission_box_extents(value)
Getter	get_emission_box_extents()

The rectangle’s extents if emission_shape is set to EMISSION_SHAPE_BOX.

PoolColorArray emission_colors

Setter	set_emission_colors(value)
Getter	get_emission_colors()

Sets the Colors to modulate particles by when using EMISSION_SHAPE_POINTS or EMISSION_SHAPE_DIRECTED_POINTS.

PoolVector3Array emission_normals

Setter	set_emission_normals(value)
Getter	get_emission_normals()

Sets the direction the particles will be emitted in when using EMISSION_SHAPE_DIRECTED_POINTS.

PoolVector3Array emission_points

Setter	set_emission_points(value)
Getter	get_emission_points()

Sets the initial positions to spawn particles when using EMISSION_SHAPE_POINTS or EMISSION_SHAPE_DIRECTED_POINTS.

Vector3 emission_ring_axis

Setter	set_emission_ring_axis(value)
Getter	get_emission_ring_axis()

The axis for the ring shaped emitter when using EMISSION_SHAPE_RING.

float emission_ring_height

Setter	set_emission_ring_height(value)
Getter	get_emission_ring_height()

The height for the ring shaped emitter when using EMISSION_SHAPE_RING.

float emission_ring_inner_radius

Setter	set_emission_ring_inner_radius(value)
Getter	get_emission_ring_inner_radius()

The inner radius for the ring shaped emitter when using EMISSION_SHAPE_RING.

float emission_ring_radius

Setter	set_emission_ring_radius(value)
Getter	get_emission_ring_radius()

The radius for the ring shaped emitter when using EMISSION_SHAPE_RING.

EmissionShape emission_shape

Default	`0`
Setter	set_emission_shape(value)
Getter	get_emission_shape()

Particles will be emitted inside this region. See EmissionShape for possible values.

float emission_sphere_radius

Setter	set_emission_sphere_radius(value)
Getter	get_emission_sphere_radius()

The sphere’s radius if EmissionShape is set to EMISSION_SHAPE_SPHERE.

bool emitting

Default	`true`
Setter	set_emitting(value)
Getter	is_emitting()

If true, particles are being emitted.

float explosiveness

Default	`0.0`
Setter	set_explosiveness_ratio(value)
Getter	get_explosiveness_ratio()

How rapidly particles in an emission cycle are emitted. If greater than 0, there will be a gap in emissions before the next cycle begins.

int fixed_fps

Default	`0`
Setter	set_fixed_fps(value)
Getter	get_fixed_fps()

The particle system’s frame rate is fixed to a value. For instance, changing the value to 2 will make the particles render at 2 frames per second. Note this does not slow down the particle system itself.

bool flag_align_y

Default	`false`
Setter	set_particle_flag(value)
Getter	get_particle_flag()

Align Y axis of particle with the direction of its velocity.

bool flag_disable_z

Default	`false`
Setter	set_particle_flag(value)
Getter	get_particle_flag()

If true, particles will not move on the z axis.

bool flag_rotate_y

Default	`false`
Setter	set_particle_flag(value)
Getter	get_particle_flag()

If true, particles rotate around Y axis by angle.

float flatness

Default	`0.0`
Setter	set_flatness(value)
Getter	get_flatness()

Amount of spread in Y/Z plane. A value of 1 restricts particles to X/Z plane.

bool fract_delta

Default	`true`
Setter	set_fractional_delta(value)
Getter	get_fractional_delta()

If true, results in fractional delta calculation which has a smoother particles display effect.

Vector3 gravity

Default	`Vector3( 0, -9.8, 0 )`
Setter	set_gravity(value)
Getter	get_gravity()

Gravity applied to every particle.

float hue_variation

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Initial hue variation applied to each particle.

Curve hue_variation_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s hue will vary along this Curve.

float hue_variation_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Hue variation randomness ratio.

float initial_velocity

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Initial velocity magnitude for each particle. Direction comes from spread and the node’s orientation.

float initial_velocity_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Initial velocity randomness ratio.

float lifetime

Default	`1.0`
Setter	set_lifetime(value)
Getter	get_lifetime()

The amount of time each particle will exist (in seconds).

float lifetime_randomness

Default	`0.0`
Setter	set_lifetime_randomness(value)
Getter	get_lifetime_randomness()

Particle lifetime randomness ratio.

float linear_accel

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Linear acceleration applied to each particle in the direction of motion.

Curve linear_accel_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s linear acceleration will vary along this Curve.

float linear_accel_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Linear acceleration randomness ratio.

bool local_coords

Default	`true`
Setter	set_use_local_coordinates(value)
Getter	get_use_local_coordinates()

If true, particles use the parent node’s coordinate space. If false, they use global coordinates.

Mesh mesh

Setter	set_mesh(value)
Getter	get_mesh()

The Mesh used for each particle. If null, particles will be spheres.

bool one_shot

Default	`false`
Setter	set_one_shot(value)
Getter	get_one_shot()

If true, only one emission cycle occurs. If set true during a cycle, emission will stop at the cycle’s end.

float orbit_velocity

Setter	set_param(value)
Getter	get_param()

Orbital velocity applied to each particle. Makes the particles circle around origin in the local XY plane. Specified in number of full rotations around origin per second.

This property is only available when flag_disable_z is true.

Curve orbit_velocity_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s orbital velocity will vary along this Curve.

float orbit_velocity_random

Setter	set_param_randomness(value)
Getter	get_param_randomness()

Orbital velocity randomness ratio.

float preprocess

Default	`0.0`
Setter	set_pre_process_time(value)
Getter	get_pre_process_time()

Particle system starts as if it had already run for this many seconds.

float radial_accel

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Radial acceleration applied to each particle. Makes particle accelerate away from origin.

Curve radial_accel_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s radial acceleration will vary along this Curve.

float radial_accel_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Radial acceleration randomness ratio.

float randomness

Default	`0.0`
Setter	set_randomness_ratio(value)
Getter	get_randomness_ratio()

Emission lifetime randomness ratio.

float scale_amount

Default	`1.0`
Setter	set_param(value)
Getter	get_param()

Initial scale applied to each particle.

Curve scale_amount_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s scale will vary along this Curve.

float scale_amount_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Scale randomness ratio.

float speed_scale

Default	`1.0`
Setter	set_speed_scale(value)
Getter	get_speed_scale()

Particle system’s running speed scaling ratio. A value of 0 can be used to pause the particles.

float spread

Default	`45.0`
Setter	set_spread(value)
Getter	get_spread()

Each particle’s initial direction range from +spread to -spread degrees. Applied to X/Z plane and Y/Z planes.

float tangential_accel

Default	`0.0`
Setter	set_param(value)
Getter	get_param()

Tangential acceleration applied to each particle. Tangential acceleration is perpendicular to the particle’s velocity giving the particles a swirling motion.

Curve tangential_accel_curve

Setter	set_param_curve(value)
Getter	get_param_curve()

Each particle’s tangential acceleration will vary along this Curve.

float tangential_accel_random

Default	`0.0`
Setter	set_param_randomness(value)
Getter	get_param_randomness()

Tangential acceleration randomness ratio.

Method Descriptions

void convert_from_particles ( Node particles )

Sets this node’s properties to match a given Particles node with an assigned ParticlesMaterial.

float get_param ( Parameter param ) const

Returns the base value of the parameter specified by Parameter.

Curve get_param_curve ( Parameter param ) const

Returns the Curve of the parameter specified by Parameter.

float get_param_randomness ( Parameter param ) const

Returns the randomness factor of the parameter specified by Parameter.

bool get_particle_flag ( Flags flag ) const

Returns the enabled state of the given flag (see Flags for options).

void restart ( )

Restarts the particle emitter.

void set_param ( Parameter param, float value )

Sets the base value of the parameter specified by Parameter.

void set_param_curve ( Parameter param, Curve curve )

Sets the Curve of the parameter specified by Parameter.

void set_param_randomness ( Parameter param, float randomness )

Sets the randomness factor of the parameter specified by Parameter.

void set_particle_flag ( Flags flag, bool enable )

Enables or disables the given flag (see Flags for options).